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A particle (mass = 2.0 mg, charge = -6.0 mC) moves in the positive direction along the x axis with a velocity of 3.0 km/s. It enters a magnetic field of (2.0i + 3.0j + 4.0k) mT. What is the acceleration of the particle? Question options: 1) (36j - 27k) m/s2 2) (-36j + 27k) m/s2 3) (-24j + 18k) m/s2 4) (24j - 18k) m/s2 5) (24j - 27k) m/s2
1) (36j - 27k) m/s2
In the subshell of the Li2+ ion with orbital quantum number , the allowed values of the magnetic quantum number are Question options: 1) - to 2) -( + 1) to ( + l) 3) -( + 2) to ( + 2) 4) -( + 3) to ( + 3) 5) 0 to n - 1
1) - to
The electron density in copper is 8.49 ´ 1028 electrons/m3. The electron charge is e = -1.60 ´ 10-19 C. When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is Question options: 1) -1.84 ´ 10-6. 2) +1.84 ´ 10-6. 3) -1.84. 4) -5.43 ´ 105. 5) +5.43 ´ 105.
1) -1.84 ´ 10-6.
An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion? Question options: 1) 0.12 ms 2) 1.2 ms 3) 0.18 ms 4) 1.8 ms 5) 1.8 ms
1) 0.12 ms
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the sun respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is Question options: 1) 0.25. 2) 0.50. 3) 1.0. 4) 2.0. 5) 4.0.
1) 0.25.
Capacitive reactance XC is given by Question options: 1) 1/wC 2) wC 3) w/C 4) C/w 5) 1/w2C
1) 1/wC
Approximately how fast is an ion of helium moving if it is in a plasma with a temperature of 108 K? m(He) = 4.002603 u and u = 1.66 ´ 10-27 kg. Question options: 1) 106 m/s 2) 104 m/s 3) 102 m/s 4) 10 m/s 5) 1 m/s
1) 106 m/s
A certain brand of hot dog cooker applies a potential difference (120 V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog, what current is needed to cook four hot dogs simultaneously in 3.0 min? Question options: 1) 11 A 2) 2.8 A 3) 8.3 A 4) 2.1 A 5) 3.6 A
1) 11 A
An electric heater draws an average power of 1100 Watts when plugged into a 110 V-rms outlet. Calculate the resistance of the heater and the rms current. Question options: 1) 11W, 10 A (rms) 2) 110W, 10 A (rms) 3) 10W, 11 A (rms) 4) 10W, 110 A (rms) 5) 0.09W, 11 A (rms)
1) 11W, 10 A (rms)
The primary winding of an electric train transformer has 400 turns and the secondary has 50. If the input voltage is 120V(rms) what is the output voltage? Question options: 1) 15 V (rms) 2) 30 V (rms) 3) 60 V (rms) 4) 2.4 V (rms) 5) 960 V (rms)
1) 15 V (rms)
A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1000 W/m2 sunlight. What is the efficiency of the solar cell? Question options: 1) 16% 2) 7% 3) 23% 4) 4% 5) 32%
1) 16%
Light strikes a diamond (n = 2.42) at an angle of 60° relative to the normal to the surface. What is the angle of refraction? Question options: 1) 21° 2) 30° 3) 38° 4) 69° 5) 71°
1) 21°
Two mirrors are at right angles to one another. If an object is placed near the mirrors, what is the largest number of images that would be seen in the mirrors? Question options: 1) 3 2) 2 3) 4 4) 5 5) 6
1) 3
Find the frequency of X-rays of wavelength 1 Å = 10-10 m. Question options: 1) 3 ´ 1018 Hz 2) 3 ´ 1010 MHz 3) 6 ´ 109 Hz 4) 3 ´ 108 Hz 5) 3 ´ 1020 Hz
1) 3 ´ 1018 Hz
How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2? Question options: 1) 3.3 ´ 10-6 J 2) 3.3 J 3) 0.003 J 4) 10-4 J 5) 3.0 ´ 105 J
1) 3.3 ´ 10-6 J
A series RLC circuit has an impedance of 120W and a resistance of 64W. What average power is delivered to this circuit when Vrms = 90 volts? Question options: 1) 36 W 2) 100 W 3) 192 W 4) 360 W 5) 12 W
1) 36 W
At what frequency will a 12-mF capacitor have a reactance XC = 300W? Question options: 1) 44 Hz 2) 88 Hz 3) 176 Hz 4) 352 Hz 5) 278 Hz
1) 44 Hz
A charged particle (m = 5.0 g, q = -70 mC) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s2 downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region? Question options: 1) 47 mT 2) zero 3) 23 mT 4) 35 mT 5) 12 mT
1) 47 mT
Green light has a wavelength of 5.4 ´ 10-7 m. What is the frequency of this EM-wave in air? Question options: 1) 5.55 ´ 1014 Hz 2) 6.00 ´ 1011 Hz 3) 9.00 ´ 108 Hz 4) 3.00 ´ 1010 MHz 5) 1.80 ´ 1015 Hz
1) 5.55 ´ 1014 Hz
How many electrons pass through a 20-W resistor in 10 min if there is a potential drop of 30 volts across it? Question options: 1) 5.6 ´ 1021 2) 7.5 ´ 1021 3) 9.4 ´ 1021 4) 1.1 ´ 1021 5) 3.8 ´ 1021
1) 5.6 ´ 1021
The intensity of radiation reaching the earth from the sun is 1350 W/m2. The earth's radius is 6.4 ´ 106 m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.) Question options: 1) 5.8 ´ 108 N 2) 1.2 ´ 109 N 3) 2.3 ´ 109 N 4) 4.6 ´ 109 N 5) 1.7 ´ 1017 N
1) 5.8 ´ 108 N
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 5.0 cm, pitch = 12 cm, period = 5.0 ms). What is the speed of this particle as it moves along this path? Question options: 1) 67 m/s 2) 26 m/s 3) 63 m/s 4) 24 m/s 5) 87 m/s
1) 67 m/s
When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances? Question options: 1) 7.2 W 2) 7.6 W 3) 6.9 W 4) 8.0 W 5) 2.8 W
1) 7.2 W
A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333). At what angle relative to the normal to the interface of the two liquids is light totally reflected? Question options: 1) 78° 2) 88° 3) 68° 4) 49° 5) the critical angle is undefined
1) 78°
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km? Question options: 1) 8 ´ 10-5 W/m2 2) 8 ´ 10-6 W/m2 3) 3 ´ 10-3 W/m2 4) 0.8 W/m2 5) 2.5 ´ 10-5 W/m2
1) 8 ´ 10-5 W/m2
A 60-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 W and C = 300 mF. The peak current in the circuit is Question options: 1) 8.24 A. 2) 8.84 A. 3) 11.0 A. 4) 12.4 A. 5) 23.5 A.
1) 8.24 A.
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T? Question options: 1) 9.9 mm 2) 1.1 cm 3) 1.3 cm 4) 1.4 cm 5) 7.6 mm
1) 9.9 mm
A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data? Question options: 1) Bx is positive. 2) Bz is positive. 3) By is negative. 4) By is positive. 5) Bx is negative.
1) Bx is positive.
Inductive reactance XL is given by Question options: 1) Lw 2) L/w 3) 1/Lw 4) w/L 5) w2L
1) Lw
Light behaves like Question options: 1) a wave at times, and a particle at other times. 2) a wave. 3) a particle. 4) both a wave and a particle, because of its dual nature.
1) a wave at times, and a particle at other times.
A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field. Question options: 1) either 39° or 141° 2) either 25° or 155° 3) either 70° or 110° 4) either 42° or 138° 5) either 65° or 115°
1) either 39° or 141°
Characteristic x-rays can be produced by bombarding targets with electrons. These x-rays occur when Question options: 1) electrons from higher shells fill the vacant lower shell 2) electrons fill the vacant valence shell 3) photons are emitted with energies on the order of 103 eV 4) photons are emitted with wavelengths on the order of 103 nm
1) electrons from higher shells fill the vacant lower shell
A neutron is characterized by the term "thermal neutron" when Question options: 1) its energy is of the order kT, where T is on the order of 0°C. 2) its energy is of the order kT, where T is on the order of 0 K. 3) its energy is of the order kT, where T is on the order of 273 K. 4) its energy is of the order kT, where T is on the order of 100°C. 5) its energy is of the order kT, where T is on the order of 0°R.
1) its energy is of the order kT, where T is on the order of 0°C.
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field? Question options: 1) negative y direction 2) positive y direction 3) negative z direction 4) positive z direction 5) negative x direction
1) negative y direction
The Pauli Exclusion Principle states Question options: 1) no two electrons in the same atom can have the same set of quantum numbers. 2) there is an inherent uncertainty in the position and momentum of a particle. 3) when an atom has orbitals of equal energy, the maximum number of electrons will have unpaired spins. 4) when an atom has orbitals of equal energy, the maximum number of electrons will be paired spins. 5) no two atoms can have the same set of quantum numbers.
1) no two electrons in the same atom can have the same set of quantum numbers.
One roentgen is defined as Question options: 1) the amount of ionizing radiation that will produce 1/3 ´ 10-9 C of electric charge in 1 cm3 of air under standard conditions. 2) the amount of radiation that deposits 10-2 J of energy into 1 kg of absorbing material. 3) the amount of radiation needed for ionization of an atom. 4) the amount of radiation needed for dissociation of a molecule. 5) the amount of radiation that deposits 1 erg of energy in 1 g of air.
1) the amount of ionizing radiation that will produce 1/3 ´ 10-9 C of electric charge in 1 cm3 of air under standard conditions.
One rad is Question options: 1) the amount of radiation that deposits 10-2 J of energy into 1 kg of absorbing material. 2) the amount of ionizing radiation that will produce 1/3 ´ 10-9 C of electric charge in 1 cm3 of air under standard conditions. 3) the amount of radiation needed for ionization of an atom. 4) the amount of radiation needed for dissociation of a molecule. 5) the amount of radiation that deposits one erg of energy in 1g of material.
1) the amount of radiation that deposits 10-2 J of energy into 1 kg of absorbing material.
A principal mechanism for energy loss during nuclear fusion is bremsstrahlung. This loss is associated with Question options: 1) x-rays emitted due to electron-ion collisions. 2) radiation losses due to T4 losses. 3) conduction losses associated with DT. 4) convection losses associated with DT. 5) neutron collisions with atoms of moderator.
1) x-rays emitted due to electron-ion collisions.
The algebraic sum of the changes of potential around any closed circuit loop is Question options: 1) zero. 2) maximum. 3) zero only if there are no sources of emf in the loop. 4) maximum if there are no sources of emf in the loop. 5) equal to the sum of the currents in the branches of the loop.
1) zero.
When a capacitor is fully charged, the current through the capacitor is Question options: 1) zero. 2) at its maximum value. 3) equal to the current in a resistive circuit in parallel with the capacitor circuit. 4) greater than the current in a resistor that is farther from the battery than the capacitor. 5) zero if it is the only capacitor, but maximum if there is another capacitor in series with it.
1) zero.
A 2.0-m wire carries a current of 15 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = (30i - 40j) mT. What is the resulting magnetic force on the wire? Question options: 1) (+1.2 k) N 2) (-1.2 k) N 3) (-1.5 k) N 4) (+1.5 k) N 5) (+0.90 k) N
2) (-1.2 k) N
A 2.0-C charge moves with a velocity of (2.0i + 4.0j + 6.0k) m/s and experiences a magnetic force of (4.0i - 20j + 12k) N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field. Question options: 1) -3.0 T 2) +3.0 T 3) +5.0 T 4) -5.0 T 5) +6.0 T
2) +3.0 T
Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10 000 m2 and the solar intensity is 1350 W/m2. Question options: 1) 0.72 N 2) 0.09 N 3) 9 N 4) 45 N 5) 0.18 N
2) 0.09 N
What energy is needed (in MeV) so two deuterium atoms moving together will reach the necessary 10-14 m for fusion? Question options: 1) 0.511 2) 0.14 3) 2.5 4) 4.3 5) 1.0
2) 0.14
A 10-mF capacitor is plugged into a 110 V-rms 60-Hz voltage source, with an ammeter in series. What is the rms value of the current through the capacitor? Question options: 1) 0.202 A (rms) 2) 0.415 A (rms) 3) 0.626 A (rms) 4) 0.838 A (rms) 5) 0.066 A (rms)
2) 0.415 A (rms)
If a mile of 24-gauge copper wire has a resistance of 0.14 kW and the resistivity of copper is 1.7 ´ 10-8 W × m, what is the diameter of the wire? (1 mile = 1.6 km) Question options: 1) 0.40 mm 2) 0.50 mm 3) 0.63 mm 4) 0.80 mm 5) 0.25 mm
2) 0.50 mm
A physicist claims that she has found a new particle with a mass 200,000 times the mass of the proton (1.67 ´ 10-27 kg) and a charge of 3.20 ´ 10-19 C. If she is correct, such a particle traveling in a circle in a uniform 5.00 T magnetic field at a velocity of 2500 m/s will have a radius of Question options: 1) 0.261 m. 2) 0.522 m. 3) 1.04 m. 4) 3.27 m. 5) 3.13 ´ 1026 m.
2) 0.522 m.
An electron in a hydrogen atom makes a transition from the n = 4 to the n = 3 energy state. Determine the energy (in eV) of the emitted photon. Question options: 1) 0.54 2) 0.66 3) 0.85 4) 1.51 5) 10.2
2) 0.66
What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT? Question options: 1) 0.65 eV 2) 0.71 eV 3) 0.84 eV 4) 0.54 eV 5) 1.4 eV
2) 0.71 eV
In an RC circuit, what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants? Question options: 1) 0.84 2) 0.90 3) 0.75 4) 0.60 5) 0.03
2) 0.90
What value of wavelength is associated with the Lyman series for n = 2? (RH = 1.097 ´ 107 m-1) Question options: 1) 8.2 ´ 106 m 2) 1.2 ´ 10-7 m 3) 2.7 ´ 106 m 4) 3.6 ´ 10-7 m 5) 8.8 ´ 10-7 m
2) 1.2 ´ 10-7 m
Most telephone cables are made of copper wire of either 24 or 26 gauge. If the resistance of 24-gauge wire is 137 W/mile and the resistance of 26-gauge wire is 220 W/mile, what is the ratio of the diameter of 24-gauge wire to that of 26-gauge wire? Question options: 1) 1.6 2) 1.3 3) 0.62 4) 0.79 5) 0.88
2) 1.3
A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s. What is the time constant for this circuit? Question options: 1) 1.5 s 2) 1.3 s 3) 1.7 s 4) 1.9 s 5) 2.9 s
2) 1.3 s
Find the resonant frequency for a series RLC circuit where R = 10W, C = 5 mF, and L = 2 mH. Question options: 1) 998 Hz 2) 1.592 kHz 3) 2.45 kHz 4) 11.3 kHz 5) 2.53 kHz
2) 1.592 kHz
A 60-Hz ac generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 W and L = 10.0 mH. The peak current in the circuit is Question options: 1) 0.963 A. 2) 10.3 A. 3) 11.0 A. 4) 11.9 A. 5) 29.2 A.
2) 10.3 A.
If the radiant energy from the sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B. Question options: 1) 300 V/m, 10-4 T 2) 1000 V/m, 3.35 ´ 10-6 T 3) 225 V/m, 1.6 ´ 10-3 T 4) 111 V/m, 3 ´ 10-5 T 5) 711 V/m, 2.37 ´ 10-6 T
2) 1000 V/m, 3.35 ´ 10-6 T
A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path? Question options: 1) 15 mm 2) 12 mm 3) 18 mm 4) 24 mm 5) 8.5 mm
2) 12 mm
What is the average kinetic energy (in keV) of an ion that has a temperature of 108 K? Question options: 1) 8 2) 13 3) 4 4) 16 5) 21
2) 13
A small bulb is rated at 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity a = 4.5 ´ 10-3 / °C. When the filament is hot and glowing, its temperature is seven times room temperature (20 °C). What is the resistance of the filament (in ohms) at room temperature? Question options: 1) 1280. 2) 1350. 3) 1911. 4) 4530. 5) 5630.
2) 1350.
A light bulb is rated at 30 W when operated at 120 V. How much charge enters (and leaves) the light bulb in 1.0 min? Question options: 1) 17 C 2) 15 C 3) 14 C 4) 13 C 5) 60 C
2) 15 C
A step-up transformer has an input voltage of 110V(rms). There are 100 turns on the primary and 1500 on the secondary. What is the output voltage? Question options: 1) 1600 V (max) 2) 1650 V (rms) 3) 3260 V (max) 4) 165 kV (rms) 5) 7.3 V (rms)
2) 1650 V (rms)
The ground state configuration of chlorine (Z = 17) is Question options: 1) 1s2 2s2 2p5 3s2 3p6 2) 1s2 2s2 2p6 3s2 3p5 3) 1s2 2s2 2p6 3s2 3p4 3d1 4) 1s2 2s2 2p6 3s2 3p5 4s1 5) 1s2 2s2 2p6 3s1 3p7
2) 1s2 2s2 2p6 3s2 3p5
A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire? Question options: 1) 3.2 mN 2) 2.1 mN 3) 5.3 mN 4) 4.2 mN 5) 6.0 mN
2) 2.1 mN
How fast is the electron moving in the first Bohr orbit? Question options: 1) 3.3 ´ 106 m/s 2) 2.2 ´ 106 m/s 3) 4.4 ´ 106 m/s 4) 5.5 ´ 106 m/s 5) 5.5 ´ 1015 m/s
2) 2.2 ´ 106 m/s
Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction? Question options: 1) 1.3 2) 2.4 3) 2.6 4) 1.8 5) 0.4
2) 2.4
An electric heater is constructed by applying a potential difference of 110 V across a wire with a resistance of 5.0 W. What is the power rating of the heater? Question options: 1) 2.0 kW 2) 2.4 kW 3) 1.7 kW 4) 1.5 kW 5) 60 kW
2) 2.4 kW
What is the average power dissipation in a series RC circuit if R = 5 kW, C = 2 mF, and V = 170 cos (300t)? Question options: 1) 0.93 W 2) 2.60 W 3) 28.2 W 4) 157 W 5) 5.20 W
2) 2.60 W
Find the number of nuclei per unit volume (n = nuclei/cm3) for lead. atomic weight = 202.7 density = 11.5 g/cm3 Avogadro's number = 6.02 ´ 1023 Question options: 1) 2.5 ´ 1022 2) 3.4 ´ 1022 3) 2.9 ´ 1022 4) 2.9 ´ 1023 5) 2.0 ´ 1021
2) 3.4 ´ 1022
An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20°, what is the angle of refraction into the air? Question options: 1) 20° 2) 30° 3) 38° 4) 69° 5) 26°
2) 30°
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2. The angle of reflection of that ray from mirror 2 is Question options: 1) 0°. 2) 30°. 3) 60°. 4) 90°. 5) 120°.
2) 30°.
The energy needed to remove an electron from the first excited state of a Li2+ ion is Question options: 1) 53 eV 2) 31 eV 3) 92 eV 4) 122 eV 5) 61 eV
2) 31 eV
A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of B? Question options: 1) 41 mT 2) 33 mT 3) 55 mT 4) 87 mT 5) 57 mT
2) 33 mT
A headwaiter at a restaurant decides to apply the exclusion principle to the seating of patrons. He will treat tables as sub-shells, and will only seat patrons if the number of the people to be seated adds up to a complete sub-shell. Of the numbers below, the number he would not be willing to seat at one table is Question options: 1) 2. 2) 4. 3) 6. 4) 10. 5) 14.
2) 4.
A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33) Question options: 1) 3.2 2) 4.4 3) 2.1 4) 1.0 5) 0.3
2) 4.4
The inductance of a tuning circuit of an AM radio is 4 mH. Find the capacitance of the circuit required for reception at 1200 kHz. Question options: 1) 2.1 pF 2) 4.4 pF 3) 21.2 pF 4) 43.4 pF 5) 27.6 pF
2) 4.4 pF
A diver shines an underwater searchlight at the surface of a pond (n = 1.33). At what angle (relative to the surface) will the light be totally reflected? Question options: 1) 47° 2) 41° 3) 51° 4) 58° 5) 49°
2) 41°
A charged particle (mass = 4.0 mg, charge = 5.0 mC) moves in a region where the only force on it is magnetic. What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s, the magnitude of the magnetic field is 8.0 mT, and the angle between the direction of the magnetic field and the velocity of the particle is 60°? Question options: 1) 39 km/s2 2) 43 km/s2 3) 48 km/s2 4) 52 km/s2 5) 25 km/s2
2) 43 km/s2
A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100W. What is the average power loss? Question options: 1) 225 W 2) 450 W 3) 980 W 4) 1.12 kW 5) 900 W
2) 450 W
A 4.0-W resistor has a current of 3.0 A in it for 5.0 min. How many electrons pass through the resistor during this time interval? Question options: 1) 7.5 ´ 1021 2) 5.6 ´ 1021 3) 6.6 ´ 1021 4) 8.4 ´ 1021 5) 2.1 ´ 1021
2) 5.6 ´ 1021
An RLC series circuit has R = 100 ohms, C = 25 mF, and L = 0.16 H. For what angular frequency of an ac voltage is the current flow maximum? Question options: 1) 251 rad/s 2) 500 rad/s 3) 757 rad/s 4) 884 rad/s 5) 79.6 rad/s
2) 500 rad/s
The energy needed to change a He+ ion in the ground state into a He2+ ion is Question options: 1) 13.6 eV 2) 54.4 eV 3) 112.4 eV 4) 92.9 eV 5) 27.2 eV
2) 54.4 eV
A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly above the fish? (For water, n = 1.33.) Question options: 1) 50 2) 60 3) 40 4) 70 5) 110
2) 60
Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30° with respect to the normal to the surface. What is the angle of reflection from the second surface? Question options: 1) 30° 2) 60° 3) 45° 4) 53° 5) 75°
2) 60°
At a distance of 10 km from a radio transmitter, the amplitude of the E-field is 0.20 volts/meter. What is the total power emitted by the radio transmitter? Question options: 1) 10 kW 2) 67 kW 3) 140 kW 4) 245 kW 5) 21 kW
2) 67 kW
Charlotte says that you can use a voltmeter to find the current direction in a wire if you can't see the terminals it is connected to. Bonnie says that an ammeter will do. Finally, Rita says that you can bring the north pole of a magnet up to the wire and determine the current direction from the direction of the magnetic force on the wire. Which one(s), if any, is(are) correct? Question options: 1) All three are correct. 2) Charlotte and Rita are correct, but Bonnie is wrong. 3) Bonnie and Rita are correct, but Charlotte is wrong. 4) Charlotte and Bonnie are correct, but Rita is wrong. 5) Only Rita is correct.
2) Charlotte and Rita are correct, but Bonnie is wrong
A cook plugs a 500 W crockpot and a 1000 W kettle into a 240 V power supply, all operating on direct current. When we compare the two, we find that Question options: 1) Icrockpot < Ikettle and Rcrockpot < Rkettle. 2) Icrockpot < Ikettle and Rcrockpot > Rkettle. 3) Icrockpot = Ikettle and Rcrockpot = Rkettle. 4) Icrockpot > Ikettle and Rcrockpot < Rkettle. 5) Icrockpot > Ikettle and Rcrockpot > Rkettle.
2) Icrockpot < Ikettle and Rcrockpot > Rkettle.
Bert says that a charged particle in a vacuum can travel in a helix only if a uniform electric field and a uniform magnetic field are both present and both parallel to the axis of the helix. Stuart says that only a magnetic field with a component parallel to the axis of the helix is needed. Which one, if either, is correct, and why? Question options: 1) Bert, because the charged particle's velocity can have a vertical component only if an electric field in the vertical direction is present. 2) Stuart, because a component of velocity in the vertical direction is not changed by a vertical component of a magnetic field. 3) Bert, because a component of velocity in the vertical direction is changed by a vertical component of a magnetic field. 4) Stuart, because an electric field in the vertical direction would cause the particle to come to a complete stop. 5) Neither, because particles cannot move in helical paths in the presence of magnetic and electric fields.
2) Stuart, because a component of velocity in the vertical direction is not changed by a vertical component of a magnetic field
Light bulb A is rated at 60 W and light bulb B is rated at 100 W. Both are designed to operate at 110 V. Which statement is correct? Question options: 1) The 60 W bulb has a greater resistance and greater current than the 100 W bulb. 2) The 60 W bulb has a greater resistance and smaller current than the 100 W bulb. 3) The 60 W bulb has a smaller resistance and smaller current than the 100 W bulb. 4) The 60 W bulb has a smaller resistance and greater current than the 100 W bulb. 5) We need to know the resistivities of the filaments to answer this question.
2) The 60 W bulb has a greater resistance and smaller current than the 100 W bulb.
To increase the current density in a wire of length and diameter D, you can Question options: 1) decrease the potential difference between the two ends of the wire. 2) increase the potential difference between the two ends of the wire. 3) decrease the magnitude of the electric field in the wire. 4) heat the wire to a higher temperature. 5) combine both (b) and (d).
2) increase the potential difference between the two ends of the wire.
For the following allowed transitions, which photon would have the largest wavelength when an electron "jumps" from one energy level, characterized by the quantum number n, to another? Question options: 1) n = 2 to n = 1 2) n = 3 to n = 2 3) n = 3 to n = 1 4) n = 1 to n = 3 5) n = 4 to n = 1
2) n = 3 to n = 2
According to Einstein's theory, the energy of a photon is Question options: 1) proportional to its wavelength. 2) proportional to its frequency. 3) constant, since the speed of light is a constant. 4) quantized, since it always appears in bundles of size, 1.6 ´ 10-19 C. 5) proportional to the square of the frequency.
2) proportional to its frequency.
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material was installed in the North or South walls of the room, she would expect that Question options: 1) the south pole of the compass would tend to point toward those walls. 2) the north pole of the compass would tend to point toward those walls. 3) the compass needle would not point in any particular direction. 4) the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. 5) the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.
2) the north pole of the compass would tend to point toward those walls.
A 60-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 W and C = 300 mF. The power factor, cos f, is Question options: 1) -1.00. 2) -0.749. 3) +0.749. 4) +0.834. 5) +1.00.
3) +0.749.
The temperature coefficient of resistivity of iron is 5.0 ´ 10-3 / °C; that of carbon is -0.50 ´ 10-3 / °C. When an iron wire and a carbon rod, each having the same 10 W resistance at 20°C, are cooled from that temperature to -80°C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is Question options: 1) -0.10. 2) +1.9. 3) +2.1. 4) -10. 5) +10.
3) +2.1.
A 2.0-C charge moves with a velocity of (2.0i + 4.0j + 6.0k) m/s and experiences a magnetic force of (4.0i - 20j + 12k) N. The x component of the magnetic field is equal to zero. Determine the z component of the magnetic field. Question options: 1) -3.0 T 2) +3.0 T 3) +5.0 T 4) -5.0 T 5) +6.0 T
3) +5.0 T
A particle (mass = 6.0 mg) moves with a speed of 4.0 km/s in a direction that makes an angle of 37° above the positive x axis in the xy plane. At the instant it enters a magnetic field of (5.0i) mT it experiences an acceleration of (8.0k) m/s2. What is the charge of the particle? Question options: 1) -4.8 mC 2) 4.0 mC 3) -4.0 mC 4) 4.8 mC 5) -5.0 mC
3) -4.0 mC
The allowed values of for the n = 3 shell in a Li2+ ion are Question options: 1) 1, 2 2) 0, 1 3) 0, 1, 2 4) 0, 1, 2, 3 5) 1, 2, 3
3) 0, 1, 2
In neutron capture by an atomic nucleus, the atomic number changes by Question options: 1) -2. 2) -1. 3) 0. 4) +1. 5) +2.
3) 0.
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path? Question options: 1) 0.13 km/s 2) 0.10 km/s 3) 0.16 km/s 4) 0.23 km/s 5) 0.06 km/s
3) 0.16 km/s
A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it. Question options: 1) 0.41 N × m 2) 0.14 N × m 3) 0.38 N × m 4) 0.27 N × m 5) 0.77 N × m
3) 0.38 N × m
How long will it take a charged 80-mF capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-W resistor? Question options: 1) 0.92 ms 2) 0.64 ms 3) 0.40 ms 4) 0.19 ms 5) 0.80 ms
3) 0.40 ms
A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N × m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field? Question options: 1) 0.37 T 2) 1.6 T 3) 0.50 T 4) 1.2 T 5) 2.5 T
3) 0.50 T
A 0.5-H inductor is connected into a 110 V-rms 60-Hz voltage source, with an ammeter in series. What is the rms value of the current through the inductor? Question options: 1) 0.189 A (rms) 2) 0.292 A (rms) 3) 0.584 A (rms) 4) 1.19 A (rms) 5) 0.093 A (rms)
3) 0.584 A (rms)
The speed of light changes when it goes from ethyl alcohol (n = 1.361) to carbon tetrachloride (n = 1.461). The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol, v2/v1, is Question options: 1) 1.99 2) 1.07 3) 0.93 4) 0.51 5) 0.76
3) 0.93
A hydrogen atom is in its first excited state (n = 2). The linear momentum of the electron is (in kg × m/s) Question options: 1) 3 ´ 10-24 2) 2 ´ 10-24 3) 1 ´ 10-24 4) 4 ´ 10-24 5) 3 ´ 10-15
3) 1 ´ 10-24
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the sun respectively. The ratio of the gravitational force exerted by the sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2. The ratio of T2 to T1 is Question options: 1) 0.25. 2) 0.50. 3) 1.0. 4) 2.0. 5) 4.0.
3) 1.0.
What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20° away from the wire? Question options: 1) 1.5 N 2) 1.3 N 3) 1.1 N 4) 1.7 N 5) 3.1 N
3) 1.1 N
A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits? Question options: 1) 2.8 2) 1.7 3) 1.3 4) 4.0 5) 1.0
3) 1.3
In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference? Question options: 1) 2.2 2) 1.9 3) 1.6 4) 3.0 5) 5.0
3) 1.6
What is the difference in frequency for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 ´ 10-7 m-1.) Question options: 1) 5.65 ´ 10-13 Hz 2) 31 Hz 3) 1.77 ´ 1012 Hz 4) 2.55 ´ 1016 Hz 5) 1.02 ´ 1017 Hz
3) 1.77 ´ 1012 Hz
A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45W. What is the resistivity of the material used to make the wire? Question options: 1) 5.6 ´ 10-7 W × m 2) 1.2 ´ 10-7 W × m 3) 1.8 ´ 10-7 W × m 4) 2.3 ´ 10-7 W × m 5) 7.1 ´ 10-7 W × m
3) 1.8 ´ 10-7 W × m
Background radiation from cosmic rays and radoactive nuclei in our surroundings is about 0.13 rem/year. Suppose we assume this all comes from cosmic rays which have an RBE factor of 1.0. The RBE factor for the most dangerous types of radiation is 20. How many rads of the most dangerous radiation could a 100-year-old person have been exposed to in her lifetime without having gone over the recommended limit of 0.5 rem/year? Question options: 1) 0.37 2) 0.50 3) 1.85 4) 13 5) 37
3) 1.85
What is the average power dissipation in an RLC series circuit with R = 10W, L = 0.1 H, C = 10 mF when driven at resonance by a 100 V-rms source? Question options: 1) 100 W 2) 500 W 3) 1000 W 4) 2 kW 5) 700 W
3) 1000 W
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region? Question options: 1) 18 mT 2) 12 mT 3) 15 mT 4) 22 mT 5) 10 mT
3) 15 mT
If R = 10 ohms, L = 0.1 henry, C = 10 mF, what is the resonant frequency for the parallel RLC-circuit? Question options: 1) 1000 Hz 2) 333 Hz 3) 159 Hz 4) 53 Hz 5) 500 Hz
3) 159 Hz
In a shell of the hydrogen atom with n = 3, the permitted values of the orbital magnetic quantum number are Question options: 1) -1, 0, 1 2) 2, 1, 0 3) 2, 1, 0, -1, -2 4) 0 5) 3, 2, 1, 0, -1, -2, -3
3) 2, 1, 0, -1, -2
A segment of wire carries a current of 25 A along the x axis from x = -2.0 m to x = 0 and then along the z axis from z = 0 to z = 3.0m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire? Question options: 1) 1.0 N 2) 5.0 N 3) 2.0 N 4) 3.6 N 5) 3.0 N
3) 2.0 N
If the maximum E-component of an electromagnetic wave is 600 V/m, what is the maximum B-component? Question options: 1) 1.4 T 2) 1.8 ´ 10-5 T 3) 2.0 ´ 10-6 T 4) 1.0 ´ 10-3 T 5) 1.6 ´ 10-10 T
3) 2.0 ´ 10-6 T
An electron has a velocity of 6.0 ´ 106 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T, and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point? Question options: 1) 2.1 ´ 1018 m/s2 2) 1.6 ´ 1018 m/s2 3) 2.6 ´ 1018 m/s2 4) 3.2 ´ 1018 m/s2 5) 3.7 ´ 1018 m/s2
3) 2.6 ´ 1018 m/s2
An experiment to measure the speed of light uses an apparatus similar to Fizeau's. The distance between the light source and the mirror is 10 m, and the wheel has 800 notches. If the wheel rotates at 9000 rev/s when the light from the source is extinguished, what is the experimental value for c (in m/s)? Question options: 1) 2.94 ´ 108 2) 2.92 ´ 108 3) 2.88 ´ 108 4) 2.98 ´ 108 5) 3.01 ´ 108
3) 2.88 ´ 108
A deuteron is accelerated from rest through a 10-kV potential difference and then moves perpendicularly to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path? (deuteron: m = 3.3 ´ 10-27 kg, q = 1.6 ´ 10-19 C) Question options: 1) 19 mm 2) 16 mm 3) 20.3 mm 4) 10 mm 5) 9.0 mm
3) 20.3 mm
The voltage 8.00 sin (400t) is applied to a series RLC circuit, with R = 200W, L = 0.100 H, and C = 1.00 mF. What are the impedance Z and the phase angle q? Question options: 1) 200 W, -37° 2) 566 W, +87° 3) 2470 W, -85.4° 4) 2540 W, -88.8° 5) 393 W, -63°
3) 2470 W, -85.4°
If 5.0 ´ 1021 electrons pass through a 20-W resistor in 10 min, what is the potential difference across the resistor? Question options: 1) 21 V 2) 32 V 3) 27 V 4) 37 V 5) 54 V
3) 27 V
Of the following states of the hydrogen atom, 1s, 2p, 3d, 4f, 4s, which answer lists all the states that are not spherically symmetrical? Question options: 1) 1s, 4s 2) 3d, 4f 3) 2p, 3d, 4f 4) 2p, 3d, 4s, 4f 5) 1s, 4s, 4f
3) 2p, 3d, 4f
An FM radio station broadcasts at 98.6 MHz. What is the wavelength of the radiowaves? Question options: 1) 60.8 m 2) 6.08 m 3) 3.04 m 4) 0.314 m 5) 0.33 cm
3) 3.04 m
Two single charged ions moving perpendicularly to a uniform magnetic field (B = 0.4 T) with speeds of 5000 km/s follow circular paths that differ in diameter by 5.0 cm. What is the difference in the mass of these two ions? Question options: 1) 2.6 ´ 10-28 kg 2) 6.4 ´ 10-28 kg 3) 3.2 ´ 10-28 kg 4) 5.1 ´ 10-28 kg 5) 1.1 ´ 10-28 kg
3) 3.2 ´ 10-28 kg
A beam of 1-MeV gamma rays incident on a piece of 1/2-cm thick lead is reduced by 50% of its initial value. How thick must the lead be to reduce the beam to 1% of its initial value? Question options: 1) 1.1 cm 2) 2.2 cm 3) 3.3 cm 4) 4.4 cm 5) 8.4 cm
3) 3.3 cm
A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path? Question options: 1) 4.1 cm 2) 2.9 cm 3) 3.4 cm 4) 5.1 cm 5) 2.4 cm
3) 3.4 cm
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 mT, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path? Question options: 1) 4.7 mm 2) 18 mm 3) 3.8 mm 4) 2.8 mm 5) 5.7 mm
3) 3.8 mm
How much energy is dissipated as heat during a two-minute time interval by a 1.5-kW resistor which has a constant 20-V potential difference across its leads? Question options: 1) 58 J 2) 46 J 3) 32 J 4) 72 J 5) 16 J
3) 32 J
Light strikes a diamond (n = 2.42) immersed in glycerin (n = 1.473) at an angle of 60° relative to the normal to the surface. What is the angle of refraction? Question options: 1) 20° 2) 60° 3) 32° 4) 64° 5) 15°
3) 32°
A particle (q = 5.0 nC, m = 3.0 mg) moves in a region where the magnetic field has components Bx = 2.0 mT, By = 3.0 mT, and Bz = -4.0 mT. At an instant when the speed of the particle is 5.0 km/s and the direction of its velocity is 120° relative to the magnetic field, what is the magnitude of the acceleration of the particle? Question options: 1) 33 m/s2 2) 17 m/s2 3) 39 m/s2 4) 25 m/s2 5) 45 m/s2
3) 39 m/s2
A diver shines light up to the surface of a flat glass-bottomed boat at an angle of 30° relative to the normal. If the index of refraction of water and glass are 1.33 and 1.5, respectively, at what angle (in degrees) does the light leave the glass (relative to its normal)? Question options: 1) 26 2) 35 3) 42 4) 22 5) 48
3) 42
A Li2+ ion undergoes a transition from the n = 4 to the n = 3 state. The energy of the emitted photon is Question options: 1) 4.5 eV 2) 10.2 eV 3) 5.95 eV 4) 2.6 eV 5) 0.66 eV
3) 5.95 eV
The number of states in the He+ ion corresponding to the principle quantum number n = 5 are Question options: 1) 18 2) 25 3) 50 4) 9 5) 11
3) 50
An ac generator with peak voltage 100 volts is placed across a 10-W resistor. What is the average power dissipated? Question options: 1) 100 W 2) 150 W 3) 500 W 4) 1000 W 5) 2000 W
3) 500 W
If an R = 1-kW resistor, a C = 1-mF capacitor, and an L = 0.2-H inductor are connected in series with a V = 150 sin (377t) volts source, what is the maximum current delivered by the source? Question options: 1) 0.007 A 2) 27 mA 3) 54 mA 4) 0.308 A 5) 0.34 A
3) 54 mA
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that approaches mirror 1 is parallel to mirror 2. The angle of reflection of that ray from mirror 1 is Question options: 1) 0°. 2) 30°. 3) 60°. 4) 90°. 5) 120°.
3) 60°.
A layer of water (n = 1.333) floats on carbon tetrachloride (n = 1.461) contained in an aquarium. What is the critical angle at the interface between the two liquids? Question options: 1) 88° 2) 78° 3) 66° 4) 58° 5) 43°
3) 66°
A rod (length = 80 cm) with a rectangular cross section (1.5 mm ´ 2.0 mm) has a resistance of 0.20 W. What is the resistivity of the material used to make the rod? Question options: 1) 6.0 ´ 10-7 W × m 2) 3.8 ´ 10-7 W × m 3) 7.5 ´ 10-7 W × m 4) 3.0 ´ 10-7 W × m 5) 4.8 ´ 10-7 W × m
3) 7.5 ´ 10-7 W × m
A rod of 2.0-m length and a square (2.0 mm ´ 2.0 mm) cross section is made of a material with a resistivity of 6.0 ´ 10-8 W × m. If a potential difference of 0.50 V is placed across the ends of the rod, at what rate is heat generated in the rod? Question options: 1) 3.0 W 2) 5.3 W 3) 8.3 W 4) 1.3 W 5) 17 W
3) 8.3 W
A rectangular coil (0.20 m ´ 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N × m. What is the current in the coil? Question options: 1) 5.0 mA 2) 1.7 A 3) 8.3 mA 4) 1.0 A 5) 42 mA
3) 8.3 mA
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a highly polished silver surface? Question options: 1) 1.4 ´ 10-2 Pa 2) 0.12 Pa 3) 9.0 ´ 10-6 Pa 4) 4.5 ´ 10-5 Pa 5) 2.3 ´ 10-6 Pa
3) 9.0 ´ 10-6 Pa
What maximum power can be generated from an 18-V emf using any combination of a 6.0-W resistor and a 9.0-W resistor? Question options: 1) 54 W 2) 71 W 3) 90 W 4) 80 W 5) 22 W
3) 90 W
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle qM1 then strikes the second mirror and reflects at qM2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is Question options: 1) 0°. 2) 45°. 3) 90°. 4) 180°. 5) 235°.
3) 90°.
A transformer is to be designed to increase the 30 kV-rms output of a generator to the transmission-line voltage of 345 kV-rms. If the primary winding has 80 turns, how many turns must the secondary have? Question options: 1) 6 2) 70 3) 920 4) 9200 5) 12
3) 920
Radioactive technetium, a gamma emitter, is taken up by the heart muscle in a medical test. The detector for the radiation emitted from the heart could be a Question options: 1) Tokamak. 2) quarter-wavelength antenna. 3) Geiger counter. 4) photoelectric tube. 5) diffraction grating.
3) Geiger counter
In a parallel RLC circuit, where IR = IR, max sin(wt), the current through the inductor, IL, is Question options: 1) IL = -IL, max sin(wt). 2) IL = IL, max sin(wt). 3) IL = -IL, max cos(wt). 4) IL = IL, max cos(wt). 5) IL = IL, max tan(wt).
3) IL = -IL, max cos(wt).
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V? Question options: 1) QVB toward the east 2) Zero 3) QVB toward the west 4) QVB upward 5) QVB toward the south
3) QVB toward the west
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V? Question options: 1) QVB toward the east 2) Zero 3) QVB toward the west 4) QVB upward 5) QVB toward the south
3) QVB toward the west
When electrons fill a subshell in which the orbitals have equal energy, the order in which the orbitals are filled is such that Question options: 1) a minimum number of electrons has unpaired spins. 2) a minimum number of electrons has intrinsic angular momentum. 3) a maximum number of electrons has unpaired spins. 4) a maximum number of electrons first fills the next energy level. 5) the maximum number of electrons has the same set of quantum numbers.
3) a maximum number of electrons has unpaired spins.
Forbidden transitions and selection rules suggest that Question options: 1) a photon has linear momentum. 2) a photon has energy. 3) a photon has angular momentum. 4) a photon has parity. 5) a photon has mass.
3) a photon has angular momentum.
Suppose Bohr had chosen the potential energy of the electron in the hydrogen atom to be V = 0 when the electron is in the orbit with n = 1. He could do this by Question options: 1) choosing n = 1 for the orbit where the kinetic energy of the electron is zero. 2) adding a constant 13.6 eV to the potential energy for all values of n. 3) adding a constant 27.2 eV to the potential energy for all values of n. 4) subtracting a constant 13.6 eV from the potential energy for all values of n. 5) subtracting a constant 27.2 eV from the potential energy for all values of n.
3) adding a constant 27.2 eV to the potential energy for all values of n.
Radiant energy reaching the Earth from the sun is not sufficient to keep the Earth's surface temperature comfortable for life. The most likely source of the additional thermal energy is from Question options: 1) fusion of hydrogen nuclei in the Earth's core. 2) fusion of high Z nuclei in the Earth's core. 3) fission of radioactive nuclei inside the Earth. 4) fission of radioactive nuclei in cosmic rays. 5) deflection of radioactive nuclei in cosmic rays.
3) fission of radioactive nuclei inside the Earth.
When light is either reflected or refracted, the quantity that does not change in either process is its Question options: 1) direction of travel. 2) dispersion. 3) frequency. 4) speed. 5) wavelength.
3) frequency.
You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the earth are directed Question options: 1) upward. 2) downward. 3) from south to north. 4) from north to south. 5) from east to west.
3) from south to north.
In 1921, Stern and Gerlach performed an experiment that first demonstrated Question options: 1) orbital angular momentum quantization 2) energy quantization 3) space quantization 4) magnetic orbital quantization 5) that particles behave like waves
3) space quantization
The battery is disconnected from a series RC circuit after the capacitor is fully charged and is replaced by an open switch. When the switch is closed, Question options: 1) the current through the resistor is always greater than the current through the capacitor. 2) the current through the resistor is always less than the current through the capacitor. 3) the current through the resistor is always equal to the current through the capacitor. 4) the capacitor does not allow current to pass. 5) the current stops in the resistor.
3) the current through the resistor is always equal to the current through the capacitor.
A monochromatic (single frequency, single wavelength) light ray in air (n = 1) enters a glass prism (n = 1.5). In the glass prism Question options: 1) both the frequency and the wavelength are the same as in air 2) the frequency is the same, but the wavelength is greater than in air. 3) the frequency is the same, but the wavelength is smaller than in air. 4) the wavelength is the same, but the frequency is greater than in air. 5) the wavelength is the same, but the frequency is smaller than in air.
3) the frequency is the same, but the wavelength is smaller than in air.
When a fast neutron collides with a hydrogen or deuterium nucleus, the most likely result is that Question options: 1) the neutron has an appreciable gain in kinetic energy, the gain being greatest for head-on collisions. 2) the neutron has an appreciable gain in kinetic energy, the gain being greatest for oblique collisions. 3) the neutron has an appreciable loss in kinetic energy, the loss being greatest for head-on collisions. 4) the neutron has an appreciable loss in kinetic energy, the loss being greatest for oblique collisions. 5) the neutron is absorbed by the hydrogen or deuterium nucleus.
3) the neutron has an appreciable loss in kinetic energy, the loss being greatest for head-on collisions.
A 60-Hz ac generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 W and L = 10.0 mH. The power factor, cos f, is Question options: 1) -1.00. 2) -0.936. 3) +0.943. 4) +0.936. 5) +1.00.
4) +0.936
In neutron capture by an atomic nucleus, the mass number of the nucleus changes by Question options: 1) -2. 2) -1. 3) 0. 4) +1. 5) +2.
4) +1.
A thermal neutron has an energy (in eV) on the order of Question options: 1) 40 2) 0.4 3) 4 4) 0.04 5) 400
4) 0.04
What value of B should be used in a velocity selector to separate out 2.0-keV protons if E is fixed at 80 kV/m? Question options: 1) 0.18 T 2) 0.11 T 3) 0.15 T 4) 0.13 T 5) 0.23 T
4) 0.13 T
Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (The linear absorption coefficient of lead is 43 cm-1 for x-rays of wavelength 60 ´ 10-12 m.) Question options: 1) 0.24 2) 0.20 3) 0.12 4) 0.16 5) 0.18
4) 0.16
An unusual lightning strike has a vertical portion with a current of -400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 mT. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is Question options: 1) 0. 2) 0.012 A, East. 3) 0.012 A, West. 4) 0.30 A, West. 5) 300 A, East.
4) 0.30 A, West.
An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 mT. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is Question options: 1) 0. 2) 0.012 A, East. 3) 0.012 A, West. 4) 0.30 A, West. 5) 300 A, East.
4) 0.30 A, West.
How many time constants must elapse if an initially charged capacitor is to discharge 55% of its stored energy through a resistor? Question options: 1) 0.60 2) 0.46 3) 0.52 4) 0.40 5) 1.1
4) 0.40
What is the resistance of a wire made of a material with a resistivity of 3.2 ´ 10-8 W × m if its length is 2.5 m and its diameter is 0.50 mm? Question options: 1) 0.16 W 2) 0.10 W 3) 1.28 W 4) 0.41 W 5) 0.81 W
4) 0.41 W
An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J) Question options: 1) 0.94 W 2) 0.81 W 3) 0.58 W 4) 0.69 W 5) 1.5 W
4) 0.69 W
A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy? Question options: 1) 0.50 B 2) 1.4 B 3) 2.0 B 4) 0.71 B 5) 1.7 B
4) 0.71 B
An LC circuit is to have resonant oscillations at 5.0 MHz. Find the value of a capacitor which will work with a 1.0-mH inductor. Question options: 1) 2 mF 2) 1 mF 3) 0.02 mF 4) 1 pF 5) 40 pF
4) 1 pF
A self-sustained chain reaction occurs when the reproduction constant, K, is equal to Question options: 1) 3.0 2) 2.0 3) 2.5 4) 1.0 5) 0.5
4) 1.0
What wavelength (in mm) is associated with the Paschen series for n = 4? (RH = 1.097 ´ 107 m-1) Question options: 1) 320 2) 530 3) 2.7 4) 1.9 5) 0.5
4) 1.9
A 60-Hz ac generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 W and L = 10.0 mH. The impedance is Question options: 1) 3.77 W. 2) 9.26 W. 3) 10.0 W. 4) 10.7 W. 5) 13.8 W.
4) 10.7 W.
An electron in a hydrogen atom makes a transition from the n = 3 to the n = 1 energy state. Determine the wavelength of the emitted photon (in nm). Question options: 1) 1006 2) 209 3) 306 4) 103 5) 821
4) 103
What angle does the orbital angular momentum make with the z axis of a hydrogen atom in the state n = 3, = 2, = -1? Question options: 1) -66° 2) 66° 3) 24° 4) 114° 5) 73°
4) 114°
A 230 000 V-rms powerline carries an average power PAV = 250 MW a distance of 200 km. If the total resistance of the cables is 10 ohms, what is the resistive power loss? Question options: 1) 1.0 MW 2) 2.5 MW 3) 5.4 MW 4) 12 MW 5) 10 kW
4) 12 MW
An incandescent lightbulb is rated at 100 Watts when plugged into a 110 V-rms household outlet. Calculate the resistance of the filament and the rms current. Question options: 1) 12.2W, 0.90 A (rms) 2) 10W, 1.0 A (rms) 3) 110W, 1.0 A (rms) 4) 121W, 0.90 A (rms) 5) 11W, 1.1 A (rms)
4) 121W, 0.90 A (rms)
A 60-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 W and C = 300 mF. The impedance is Question options: 1) 4.68 W. 2) 8.84 W. 3) 10.0 W. 4) 13.4 W. 5) 18.8 W.
4) 13.4 W.
An ideal step-down transformer has 200 primary turns and 50 secondary turns. If 440 volts (rms) is placed across the primary, what is the current in the secondary when the load resistance is 7 ohms? Question options: 1) 3.6 A (rms) 2) 7.3 A (rms) 3) 11.4 A (rms) 4) 15.7 A (rms) 5) 12.4 A (rms)
4) 15.7 A (rms)
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 mT, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the pitch of the resulting helical path? Question options: 1) 13 mm 2) 32 mm 3) 24 mm 4) 18 mm 5) 3.8 mm
4) 18 mm
What is the magnitude of the magnetic force on a charged particle (Q = 5.0 mC) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = -4.0 T, and Bz = 3.0 T? Question options: 1) 2.8 N 2) 1.6 N 3) 1.2 N 4) 2.0 N 5) 0.4 N
4) 2.0 N
At what frequency will a 50-mH inductor have a reactance XL = 700W? Question options: 1) 352 Hz 2) 777 Hz 3) 1.25 kHz 4) 2.23 kHz 5) 14 kHz
4) 2.23 kHz
A high-voltage powerline operates at 500 000 V-rms and carries an rms current of 500 A. If the resistance of the cable is 0.050W/km, what is the resistive power loss in 200 km of the powerline? Question options: 1) 250 kW 2) 500 kW 3) 1 Megawatt 4) 2.5 Megawatts 5) 250 Megawatts
4) 2.5 Megawatts
An aquarium contains a 5-cm layer of water (n = 1.33) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the air is 30°, what is the angle of refraction into the carbon tetrachloride? Question options: 1) 58° 2) 69° 3) 37° 4) 20° 5) 75°
4) 20°
A 2-mF capacitor in series with a 2-kW resistor is connected to a 60-Hz ac source. Calculate the impedance of the circuit. Question options: 1) 1500 ohms 2) 1800 ohms 3) 2100 ohms 4) 2400 ohms 5) 8600 ohms
4) 2400 ohms
Light is emitted by hydrogen atoms in the visible range for a hydrogen atom. Its wavelength is 656 nm. What value of n is associated with the light? (RH = 1.097 ´ 107 m-1) Question options: 1) 5 2) 2 3) 4 4) 3 5) 6
4) 3
If 480 C pass through a 4.0-W resistor in 10 min, what is the potential difference across the resistor? Question options: 1) 3.6 V 2) 2.8 V 3) 2.4 V 4) 3.2 V 5) 5.0 V
4) 3.2 V
An electron is moving at a speed of 2.1 ´ 106 m/s in the first Bohr orbit. Determine its de Broglie wavelength. Question options: 1) 0.3 ´ 10-10 m 2) 1.7 ´ 10-10 m 3) 0.5 ´ 10-10 m 4) 3.5 ´ 10-10 m 5) 1.5 ´ 10-10 m
4) 3.5 ´ 10-10 m
A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = -2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire? Question options: 1) 3.2 ILB 2) 5.0 ILB 3) 4.2 ILB 4) 3.6 ILB 5) 1.0 ILB
4) 3.6 ILB
A segment of wire carries a current of 25 A along the x axis from x = -2.0 m to x = 0 and then along the y axis from y = 0 to y = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire? Question options: 1) 2.0 N 2) 5.0 N 3) 1.0 N 4) 3.6 N 5) 3.0 N
4) 3.6 N
The Earth is 1.49 ´ 1011 meters from the sun. If the solar radiation at the top of the Earth's atmosphere is 1340 W/m2, what is the total power output of the sun? Question options: 1) 7.10 ´ 1027 W 2) 2.20 ´ 1030 W 3) 6.62 ´ 1026 W 4) 3.74 ´ 1026 W 5) 2.98 ´ 1025 W
4) 3.74 ´ 1026 W
A resistor of unknown resistance and a 15-W resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance? Question options: 1) 75 W 2) 12 W 3) 7.5 W 4) 30 W 5) 5.0 W
4) 30 W
An electron moves in a region where the magnetic field is uniform and has a magnitude of 80 mT. The electron follows a helical path which has a pitch of 9.0 mm and a radius of 2.0 mm. What is the speed of this electron as it moves in this region? Question options: 1) 48 km/s 2) 28 km/s 3) 20 km/s 4) 35 km/s 5) 8.0 km/s
4) 35 km/s
A light ray whose frequency is 6 ´ 1014 Hz in vacuum is incident on water (n = 1.33). The wavelength of the light after it enters the water is (in nm) Question options: 1) 798 2) 500 3) 665 4) 376 5) 266
4) 376
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a flat black surface? Question options: 1) 2.25 ´ 10-5 Pa 2) 0.06 Pa 3) 7 ´ 10-4 Pa 4) 4.5 ´ 10-6 Pa 5) 9.0 ´ 10-6 Pa
4) 4.5 ´ 10-6 Pa
A particle (q = -4.0 mC, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2. What is the magnitude of the magnetic field? Question options: 1) 5.3 mT 2) 4.9 mT 3) 5.1 mT 4) 4.7 mT 5) 3.6 mT
4) 4.7 mT
A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 ´ 10-27 kg, q = 1.6 ´ 10-19 C) Question options: 1) 82 km 2) 59 km 3) 71 km 4) 48 km 5) 7.5 km
4) 48 km
Of the following states, 5s, 3p, 4f, 5p, 4g, 3d, and 2p, the one which is NOT allowed is Question options: 1) 3p 2) 4f 3) 3d 4) 4g 5) 2p
4) 4g
A person in a boat sees a fish in the water (n = 1.33), the light rays making an angle of 40° relative to the water's surface. What is the true angle (in degrees) relative to the water's surface of the same rays when beneath the surface? Question options: 1) 40 2) 35 3) 50 4) 55 5) 61
4) 55
A light ray is incident on the surface of water (n = 1.33) at an angle of 60° relative to the normal to the surface. The angle of the reflected wave is Question options: 1) 80° 2) 40° 3) 20° 4) 60° 5) 30°
4) 60°
What should be the height of a dipole antenna (of dimensions 1/4 wavelength) if it is to transmit 1200 kHz radiowaves? Question options: 1) 11.4 m 2) 60 cm 3) 1.12 m 4) 62.5 m 5) 250 m
4) 62.5 m
What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N × m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop? Question options: 1) 66 A 2) 89 A 3) 61 A 4) 75 A 5) 37 A
4) 75 A
What is the average value of the magnitude of the Poynting vector S at 1 meter from a 100-watt lightbulb radiating in all directions? Question options: 1) 1 W/m2 2) 4 W/m2 3) 2 W/m2 4) 8 W/m2 5) 12 W/m2
4) 8 W/m2
What is the difference in wavelength for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 ´ 10-7 m-1.) Question options: 1) 1.0 ´ 10-10 m 2) 2.0 ´ 10-10 m 3) 4.1 ´ 10-10 m 4) 8.1 ´ 10-10 m 5) 1.6 ´ 10-9 m
4) 8.1 ´ 10-10 m
A primary current of 6 A exists in an ideal iron-core transformer at a primary voltage of 100 volts. If the current in the secondary is 0.75 A, calculate the output voltage. Question options: 1) 12.5 V 2) 40 V 3) 400 V 4) 800 V 5) 200 V
4) 800 V
A circular loop (radius = 0.50 m) carries a current of 3.0 A and has unit normal vector of (2i - j + 2k)/3. What is the x component of the torque on this loop when it is placed in a uniform magnetic field of (2i - 6j)T? Question options: 1) 4.7 N × m 2) 3.1 N × m 3) 19 N × m 4) 9.4 N × m 5) 12 N × m
4) 9.4 N × m
A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (rAl = 2.82 ´ 10-8 W × m; aAl = 3.9 ´ 10-3 / °C; rnichrome = 1.50 ´ 10-6 W × m; anichrome = 0.40 ´ 10-3 / °C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire is Question options: 1) 0.019. 2) 0.10. 3) 0.18. 4) 9.8. 5) 53.
4) 9.8.
An energy of 13.6 eV is needed to ionize an electron from the ground state of a hydrogen atom. What wavelength is needed if a photon accomplishes this task? Question options: 1) 60 nm 2) 80 nm 3) 70 nm 4) 90 nm 5) 40 nm
4) 90 nm
In a parallel RLC circuit, where IR = IR, max sin(wt), the current through the capacitor, IC, is Question options: 1) IC = -IC, max sin(wt). 2) IC = IC, max sin(wt). 3) IC = -IC, max cos(wt). 4) IC = IC, max cos(wt). 5) IC = IC, max tan(wt).
4) IC = IC, max cos(wt).
In a typical transmission line, the current I is very small and the voltage V is very large. A unit length of line has resistance R. For a power line that supplies power to 10,000 households, we can conclude that Question options: 1) IV = I2R. 2) I = V/R. 3) IV < I2R. 4) IV > I2R. 5) I2R = 0.
4) IV > I2R.
Which of the following statements is true? Question options: 1) L can never be perpendicular to B. 2) L can be aligned parallel to B. 3) L must be perpendicular to B. 4) L can never be aligned parallel to B.
4) L can never be aligned parallel to B.
The first successful measurement of the speed of light was made by Question options: 1) Rene Descartes. 2) Armand Fizeau. 3) Christian Huygens. 4) Ole Roemer. 5) James Maxwell.
4) Ole Roemer.
Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field? Question options: 1) The charge that is at rest. 2) The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released. 3) The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released. 4) The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released. 5) All the charges above experience equal forces when released in the same magnetic field.
4) The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released.
High frequency alternating current is passed through a solenoid that contains a solid copper core insulated from the coils of the solenoid. Which statement is correct? Question options: 1) A copper core remains cool no matter what the frequency of the current in the solenoid is. 2) The copper core remains cool because the induced emf is parallel to the solenoid axis and fluctuates rapidly. 3) The copper core heats up because an emf parallel to the solenoid axis is induced in the core. 4) The copper core heats up because circular currents around its axis are induced in the core. 5) The copper core heats up because the electric field induced in the copper is parallel to the magnetic field produced by the solenoid.
4) The copper core heats up because circular currents around its axis are induced in the core.
An alternating current circuit has resistance R, inductance L and capacitance C in series with a voltage source. Which statement is correct? Question options: 1) The voltage across the capacitor leads the voltage across the inductor by 90°. 2) The voltage across the inductor leads the voltage across the capacitor by 90°. 3) The voltage across the inductor leads the voltage across the resistor by 180°. 4) The voltage across the inductor leads the voltage across the capacitor by 180°. 5) Both voltages lead the voltage across the resistor by 90°.
4) The voltage across the inductor leads the voltage across the capacitor by 180°.
In a completely filled atomic shell, Question options: 1) the intrinsic spin of the electrons does not produce a resultant magnetic moment. 2) the orbital motion of the electrons does not produce a resultant magnetic moment. 3) the electrons do not contribute to paramagnetic or ferromagnetic effects. 4) all of the above are correct. 5) none of the above are correct.
4) all of the above are correct.
At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to Question options: 1) the speed of radio waves. 2) the speed of light. 3) the speed of gamma rays. 4) all of the above. 5) only (a) and (b) above.
4) all of the above.
Magnetic fields are produced by Question options: 1) constant electric currents. 2) electric currents that vary sinusoidally with time. 3) time-varying electric fields. 4) all of the above. 5) only (a) and (b) above.
4) all of the above.
You can raise the temperature of an object with Question options: 1) microwaves. 2) infrared waves. 3) ultraviolet rays. 4) all of the above. 5) only (a) and (b) above.
4) all of the above.
A particle (m = 3.0 mg, q = 5.0 mC) moves in a uniform magnetic field given by (60j) mT. At t = 0 the velocity of the particle is equal to (30j - 40k) m/s. The subsequent path of the particle is Question options: 1) circular with a 50-cm radius. 2) helical with a 6.3-cm pitch. 3) circular with a period of 31 ms. 4) helical with a 40-cm radius. 5) none of the above
4) helical with a 40-cm radius.
One reason why we know that magnetic fields are not the same as electric fields is because the force exerted on a charge +q Question options: 1) is in opposite directions in electric and magnetic fields. 2) is in the same direction in electric and magnetic fields. 3) is parallel to a magnetic field and perpendicular to an electric field. 4) is parallel to an electric field and perpendicular to a magnetic field. 5) is zero in both if the charge is not moving.
4) is parallel to an electric field and perpendicular to a magnetic field.
Which of the following is not a radiation detector? Question options: 1) cloud chamber 2) Geiger counter 3) scintillation counter 4) neutron activation 5) spark chamber
4) neutron activation
The nuclear scattering cross-sections of neutrons depend most strongly on the neutron's Question options: 1) mass 2) area 3) volume 4) speed 5) charge
4) speed
A rem (roentgen equivalent in man) is defined as (the product of) Question options: 1) the dose in RBE. 2) the dose in roentgen and the RBE factor. 3) the dose in rad times the dose in roentgen. 4) the dose in rad and the RBE factor. 5) the dose in rad and energy of radiation.
4) the dose in rad and the RBE factor.
Whenever the alternating current frequency in a series RLC circuit is halved, Question options: 1) the inductive reactance is doubled and the capacitive reactance is halved. 2) the inductive reactance is doubled and the capacitive reactance is doubled. 3) the inductive reactance is halved and the capacitive reactance is halved. 4) the inductive reactance is halved and the capacitive reactance is doubled. 5) the reactance of the circuit remains the same.
4) the inductive reactance is halved and the capacitive reactance is doubled.
In an atom that has an electron in a sub-shell for which = 4, with respect to the magnetic field vector B the magnetic moment vector m of the electron is allowed to be oriented in Question options: 1) any direction. 2) discrete directions 3) - 1 discrete directions. 4) + 1 discrete directions. 5) 2 + 1 discrete directions.
5) 2 + 1 discrete directions.
An open circuit consists of a 12 mF parallel plate capacitor charged to 200 V and a 10 W resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is Question options: 1) 1.2 mA. 2) 2.4 ´ 10-4 A. 3) 2.4 mA. 4) 10 A. 5) 20 A.
5) 20 A
A small bulb is rated at 7.5 W when operated at 125 V. Its resistance (in ohms) is Question options: 1) 0.45. 2) 7.5. 3) 17. 4) 940. 5) 2100.
5) 2100.
The angle between two plane mirrors that meet at one edge is 45°. The change in direction of a ray that strikes the first mirror at a 60° angle of incidence when that ray reflects from the second mirror is Question options: 1) 0°. 2) 45° 3) 90° 4) 180° 5) 270°
5) 270°
Jadeen says that you can increase the resistance of a copper wire by hammering the wire to make it narrower and longer. Arnell says that you can increase its resistance by heating the wire. Which one, if either, is correct, and why? Question options: 1) Arnell, because the resistivity of the wire increases when it is heated. 2) Arnell, because the resistivity of the wire decreases when it is heated. 3) Jadeen, because the resistivity of a wire is inversely proportional to its area and directly proportional to its length. 4) Jadeen, because the resistivity of a copper wire does not decrease and might increase when it is hammered. 5) Both are correct because (a) and (d) are both correct.
5) Both are correct because (a) and (d) are both correct.
Jadeen says that you can increase the resistance of a copper wire by hammering the wire to make it narrower and longer. Arnell says that you can increase its resistance by heating the wire. Which one, if either, is correct, and why? Question options: 1) Arnell, because the conductivity of the wire increases when it is heated. 2) Arnell, because the conductivity of the wire decreases when it is heated. 3) Jadeen, because the conductivity of a wire is directly proportional to its area and inversely proportional to its length. 4) Jadeen, because the conductivity of a copper wire does not increase and might decrease when it is hammered. 5) Both are correct because (b) and (d) are both correct.
5) Both are correct because (b) and (d) are both correct.
Aline says that the magnetic moment of an atom originates in the orbital angular momentum of the electron. Bevis says that it comes from the electron spin. Which one, if either, is correct, and why? Question options: 1) Aline, because only atoms, not electrons, can have angular momentum. 2) Bevis, because only atoms, not electrons, can have angular momentum. 3) Neither, because electron spin and orbital angular momentum always cancel exactly. 4) Neither, because the magnetic moment of an atom comes only from the spin of the nucleus. 5) Both, because both the orbital angular momentum and the spins of the electrons contribute to the magnetic moment of an atom.
5) Both, because both the orbital angular momentum and the spins of the electrons contribute to the magnetic moment of an atom.
In order to control a nuclear reactor, control rods can be pulled out of or pushed into the reactor core by remote control. These rods control the reactor by Question options: 1) slowing down the fast neutrons so the neutrons can be absorbed by 238U. 2) speeding up slow neutrons so the neutrons can be absorbed by 238U. 3) slowing down fast neutrons so they cannot initiate further fusion reactions in 235U. 4) speeding up fast neutrons so they cannot initiate further fusion reactions in 235U. 5) capturing thermal neutrons so they cannot initiate further fission reactions in 235U.
5) capturing thermal neutrons so they cannot initiate further fission reactions in 235U.
In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because Question options: 1) the potential of the nearest battery is the potential at the junction. 2) there are no transformations of energy from one type to another in a circuit loop. 3) capacitors tend to maintain current through them at a constant value. 4) current is used up after it leaves a junction. 5) charge is neither created nor destroyed at a junction.
5) charge is neither created nor destroyed at a junction.
In the atmosphere, the shortest wavelength electromagnetic waves are called Question options: 1) microwaves. 2) infrared waves. 3) ultraviolet waves. 4) X-rays. 5) gamma rays.
5) gamma rays.
Rubidium (Z = 37) and potassium (Z = 19) are similar to sodium in that they have ____ electron(s) in the outermost shell. Question options: 1) five p 2) three p 3) two s 4) one d 5) one s
5) one s
A nuclear reactor is said to be critical when the average number of neutrons from each fission event that cause(s) another fission event is Question options: 1) <1. 2) 1. 3) >1. 4) any of the above. 5) only (b) or (c) above.
5) only (b) or (c) above.
When a light ray travels between any two points, the path it takes is the one that Question options: 1) covers the greatest distance. 2) follows the greatest index of refraction. 3) avoids travel in more than one medium. 4) is the mean between the longest and the shortest paths. 5) takes the least time.
5) takes the least time.
In the Drude model of electrical conduction, the current density is directly proportional to Question options: 1) the average time interval between successive collisions. 2) the number of charge carriers per unit volume. 3) the square of the electron charge. 4) the electric field present in the wire. 5) the product of all four quantities listed above.
5) the product of all four quantities listed above.
In the Drude model of electrical conduction, the current density is NOT directly proportional to Question options: 1) the average time interval between successive collisions. 2) the number of charge carriers per unit volume. 3) the square of the electron charge. 4) the electric field present in the wire. 5) the resistivity of the wire.
5) the resistivity of the wire.
The average power input to a series alternating current circuit is minimum when Question options: 1) there are only a resistor and capacitor in the circuit. 2) there are only a resistor and inductor in the circuit. 3) there is only a resistor in the circuit. 4) XL = XC and the circuit contains a resistor, an inductor and a capacitor. 5) there is only a capacitor in the circuit.
5) there is only a capacitor in the circui
