Circuit Board Game
A 0.20 m long copper rod has constant velocity 0.30 m/s traveling through a uniform magnetic field of 0.060 T. The rod, velocity, and magnetic field are all mutually perpendicular. What is the potential difference induced across the rod's length? A) 0.0036 V B) 0.040 V C) 0.090 V D) 1.0 V
A. .0036 V
Two point objects each carrying charge 10Q are separated by a distance d. The force between them is F. If half the charge on one object is transferred to the other object while at the same time the distance between them is doubled, what is the new force between the two objects? (A) 0.19 F (B) 0.25 F (C) 0.75 F (D) 4.0 F
A. .19F
An atomic particle of mass m moving at speed v is found to have wavelength λ. What is the wavelength of a second particle with three times the speed and twice the mass? A) 3λ/2 B) 2λ/3 C) 6λ D) λ/6
A. 3λ/2
An alpha particle is accelerated to a velocity v in a particle accelerator by a potential difference of 1200 V. Which of the following potential differences would be needed to give the alpha particle twice the velocity? (A) 4800 V (B) 4100 V (C) 2400 V (D) 1700 V
A. 4800 V
A positive point charge exerts a force of magnitude F on a negative point charge placed a distance x away. The negative point charge is replaced with a positive point charge and the distance between the two point charges is halved. What is the magnitude of the new force that the positive point charge exerts on the negative point charge? (A) 4F (B) 2F (C) F (D) F/2
A. 4F
Two resistors, one with resistance R and the second with resistance 4R are placed in a circuit with a voltage V. If resistance R dissipates power P, what would be the power dissipated by the 4R resistance? (A) 4 P (B) P (C) 1/2 P (D) 1/4 P
A. 4P
A positive charge of 3.0 × 10^ -8 coulomb is placed in an upward directed uniform electric field of 4.0 × 10^ 4 N/C. When the charge is moved 0.5 meter upward, the work done by the electric force on the charge is (A) 6 × 10^ -4 J (B) 12 × 10^ -4 J (C) 2 × 10^ 4 J
A. 6 × 10^ -4 J
Two identical electrical point charges Q, separated by a distance d produce an electrical force of F on one another. If the distance is decreased to a distance of 0.40d, what is the strength of the resulting force? (A) 6.3F (B) 2.5F (C) 0.40F (D) 0.16F
A. 6.3 F
In the Bohr model of the atom, the postulate stating that the orbital angular momentum of the electron is quantized can be interpreted in which of the following ways? (A) An integral number of electron wavelengths must fit into the electron's circular orbit. (B) Only one electron can exist in each possible electron state. (C) The atom is composed of a small, positively charged nucleus orbited by electrons. (D) An incident photon is completely absorbed when it causes an electron to move to a higher energy state.
A. An integral number of electron wavelengths must fit into the electron's circular orbit.
When two resistors, having resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5 . Which of the following statements about the resistances is correct? (A) Both R1 and R2 are greater than 5 . (B) Both R1 and R2 are equal to 5 . (C) Both R1 and R2 are less than 5 . (D) The sum of R1 and R2 is 5 .
A. Both are greater than 5
When one uses a magnifying glass to read fine print, one uses a (A) converging lens to produce a virtual image of the print (B) converging lens to produce a real image of the print (C) mirror to produce a virtual image of the print (D) diverging lens to produce a real image of the print
A. Converging lens to produce a virtual image of the print
A positively charged particle of mass M is at rest on a table. A non-zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about the magnitude of the electric force on the particle FE compared to the magnetic force on the particle FB? A) FE > FB B) FE < FB C) FE = FB D) It cannot be determined without knowing the exact value of the charge of the particle
A. FE > FB
A long straight wire conductor is placed below a compass as shown in the top view figure. When a large conventional current flows in the conductor as shown, the N pole of the compass: A) has its polarity reversed B) points to the south C) points to the west D) points to the east
A. Has its polarity reversed
Two isolated parallel plates are separated by a distance d. They carry opposite charges Q and each has surface area A. Which of the following would increase the strength of the electric field between the plates? I. Increasing Q II. Increasing A III. Increasing d (A) I only (B) II only (C) III only (D) II & III only
A. I only
Which statement about a system of point charges that are fixed in space is necessarily true? (A) If the potential energy of the system is negative, net positive work by an external agent is required to take the charges in the system back to infinity. (B) If the potential energy of the system is positive, net positive work is required to bring any new charge not part of the system in from infinity to its final resting location. (C) If the potential energy of the system is zero, no negative charges are in the configuration. (D) If the potential energy of the system is negative, net positive work by an external agent was required to assemble the system of charges.
A. If the potential energy of the system is negative, net positive work by an external agent is required to take the charges in the system back to infinity.
The two charged metal spheres X and Y shown above are far apart, and each is isolated from all other charges. The radius of sphere X is greater than that of sphere Y, and the magnitudes of the electric fields just outside their surfaces are the same. How does the charge on sphere X compare with that on sphere Y? (A) It is greater. (B) It is less. (C) It is the same. (D) It cannot be determined without knowing the actual value of the electric field just outside the spheres.
A. It is greater
Which of the following is true about the net force on an uncharged conducting sphere in a uniform electric field? (A) It is zero. (B) It is in the direction of the field. (C) It is in the direction opposite to the field. (D) It causes the sphere to oscillate about an equilibrium position.
A. It is zero
Lenses in fine quality cameras are coated to reduce the reflection from the lenses. If the coating material has an index of refraction between that of air and glass, what thickness of coating will produce the least reflection? A) one-quarter of the wavelength in the coating B) one-third of the wavelength in the coating C) one-half of the wavelength in the coating D) one wavelength in the coating
A. One-quarter of the wavelength in the coating
A point charge +Q is inside an uncharged conducting spherical shell that in turn is near several isolated point charges, as shown above. The electric field at point P inside the shell depends on the magnitude of (A) Q only (B) the charge distribution on the sphere only (C) Q and the charge distribution on the sphere (D) all of the point charges
A. Q only
The total capacitance of several capacitors in parallel is the sum of the individual capacitances for which of the following reasons? (A) The charge on each capacitor depends on its capacitance, but the potential difference across each is the same. (B) The charge is the same on each capacitor, but the potential difference across each capacitor depends on its capacitance. (C) Capacitors in a circuit always combine like resistors in series. (D) The parallel combination increases the effective separation of the plates.
A. The charge on each capacitor depends on its capacitance, but the potential difference across each is the same.
An image is formed on a screen by a convergent lens. If the top half of the lens is then covered what will happen to the image? (A) the image is dimmer but otherwise unchanged (B) the image becomes half as big (C) only the top half of the image is produced (D) only the bottom half of the image is produced
A. The image is dimmer but otherwise unchanged
Monochromatic light falling on the surface of an active metal causes electrons to be ejected from the metallic surface with a maximum kinetic energy of E. What would happen to the maximum energy of the ejected electrons if the frequency of the light were doubled? A) the maximum energy of the electrons would be ½ E B) the maximum energy of the electrons would be (√2) E C) the maximum energy of the electrons would be 2E D) the maximum energy of the electrons would be greater than 2E
A. The maximum energy of the electrons would be ½ E
A nucleus of tritium contains 2 neutrons and 1 proton. If the nucleus undergoes beta decay, emitting an electron, the nucleus is transmuted into A) the nucleus of an isotope of helium B) the nucleus of an isotope of lithium C) an alpha particle D) a triton
A. The nucleus of an isotope of helium
A very slow proton has its kinetic energy doubled. What happens to the protons corresponding de Broglie wavelength A) the wavelength is decreased by a factor of √2 B) the wavelength is halved C) the wavelength is increased by a factor of √2 D) the wavelength is doubled.
A. The wavelength is decreased by a factor of √2
Two light wires are hung vertically. With electrical current in both wires directed upwards A) the wires will experience a force of attraction B) the wires will experience a force of repulsion C) the force on the right hand wire will cancel the force on the left hand wire D) both wires will experience a torque until they are at right angles to each other
A. The wires will experience a force of attraction
An object is placed in front of a converging thin lens at a distance from the center of the lens equal to half the focal length. Compared to the object, the image is (A) upright and larger (B) upright and smaller (C) inverted and larger (D) inverted and smaller
A. Upright and larger
An object is in front of a convex lens, at a distance less than the focal length from the lens. Its image is (A) virtual and larger than the object. (B) real and smaller than the object. (C) virtual and smaller than the object. (D) real and larger than the object.
A. Virtual and larger than the object
In the photoelectric effect experiment, a stopping potential of Vstop is needed when light of frequency fo shines on the electron-emitting metal surface. If the metal surface on which the light shines is replaced with a new material that has half the work function, what is the new stopping potential, Vnew , for light of frequency shining on it? A) Vnew > 2Vstop B) Vnew = 2 Vstop C) Vstop < Vnew < 2Vstop D) It is indeterminate from the given information
A. Vnew > 2Vstop
If the only force acting on an electron is due to a uniform electric field, the electron moves with constant (A) acceleration in a direction opposite to that of the field (B) acceleration in the direction of the field (C) speed in a direction opposite to that of the field (D) speed in the direction of the field
A. acceleration in a direction opposite to that of the field
The electric field E just outside the surface of a charged conductor is (A) directed perpendicular to the surface (B) directed parallel to the surface (C) zero (D) infinite
A. directed perpendicular to the surface
Multiple Correct. A small light bulb is placed 20 cm to the right of a converging lens of focal length 10 cm. Which of the following statements are true about the image of the bulb formed by the lens? Select two answers. (A) It is virtual (B) It is inverted (C) It is one-half the size of the bulb (D) It is 20 cm to the left of the lens
B & D. It is inverted and 20 cm to the left of the lens
A concave mirror with a radius of curvature of 1.0 m is used to collect light from a distant star. The distance between the mirror and the image of the star is most nearly (A) 0.25 m (B) 0.50 m (C) 0.75 m (D) 1.0 m
B. .50 m
50,000 W radio station transmits waves of wavelength 4 m. Which of the following is the best estimate of the number of photons it emits per second? (A) 10^22 (B) 10^30 (C) 10^40 (D) 10^56
B. 10^30
An electrical charge Q is placed at one vertex of an equilateral triangle. When an identical charge is placed at another vertex, each charge feels a force of 15 N. When a third charge identical to the first two, is placed at the third vertex, what would be the magnitude of the force on each charge? (A) 15 N (B) 26 N (C) 30 N (D) 42 N
B. 26 N
A diffraction grating of 1000 lines/cm has red light of wavelength 700 nm pass through it. The distance between the first and third principal bright spots on a screen 2 m away is A) 14 cm B) 28 cm C) 42 cm D) 140 cm
B. 28 cm
A wire of length L and radius r has a resistance R. What is the resistance of a second wire made from the same material that has a length L/2 and a radius r/2? (A) 4R (B) 2R (C) R (D) R/2
B. 2R
An ion with charge q, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion's path? A) 4R B) 2R C) R/2 D) R/4
B. 2R
A hollow metal sphere of radius R is positively charged. Of the following distances from the center of the sphere, which location will have the greatest electric field strength? (A) 0 (center of the sphere) (B) 3R/2 (C) 2R (D) None of the above because the field is of constant strength
B. 3R/2
In order to produce an enlarged, upright image of an object, you could use a (A) converging lens more than one focal length from the object. (B) converging lens less than one focal length from the object. (C) diverging lens more than one focal length from the object. (D) diverging lens exactly one focal length from the object.
B. Converging lens less than one focal length from the object
A student wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a light bulb be modified in order to make the light bulb produce more light at a given voltage? (A) Increase the resistivity only. (B) Increase the diameter only. (C) Decrease the diameter only. (D) Decrease the diameter and increase the resistivity
B. Increase the diameter only.
An isolated capacitor with air between its plates has a potential difference Vo and a charge Qo. After the space between the plates is filled with oil, the difference in potential is V and the charge is Q. Which of the following pairs of relationships is correct? (A) Q = Qo and V > Vo (B) Q = Qo and V < Vo (C) Q > Qo and V = Vo (D) Q < Qo and V < Vo
B. Q = Qo and V < Vo
A 60-W incandescent bulb and a 13.3-Watt compact fluorescent light are both plugged into a 110-volt household circuit and lit. Which bulb has the greater resistance? (A) Neither, since they are connected across the same potential difference. (B) The 60-W bulb, because it draws more current. (C) The 13.3-W bulb, because it uses less power (D) The 13.3-W bulb, because it is more efficient.
B. The 60-W bulb, because it draws more current.
A sheet of material is inserted between the plates of an isolated charged parallel-plate capacitor. Which of the following statements is true? (A) The capacitance decreases. (B) The potential difference across the capacitor decreases. (C) The charge on the capacitor plates decreases (D) The electric field between the capacitor plates increases.
B. The potential difference across the capacitor decreases
A current through the thin filament wire of a light bulb causes the filament to become white hot, while the larger wires connected to the light bulb remain much cooler. This happens because (A) the larger connecting wires have more resistance than the filament. (B) the thin filament has more resistance than the larger connecting wires. (C) the filament wire is not insulated. (D) the current in the filament is greater than that through the connecting wires.
B. The thin filament has more resistance than the larger connecting wires.
A positively charged object is brought near but not in contact with the top of an uncharged gold leaf electroscope. The experimenter then briefly touches the electroscope with a finger. The finger is removed, followed by the removal of the positively charged object. What happens to the leaves of the electroscope when a negative charge is now brought near but not in contact with the top of the electroscope? (A) they remain uncharged (B) they move farther apart (C) they move closer together (D) they remain negatively charged but unmoved
B. They move farther apart
A diverging lens produces an image of a real object. This image is (A) virtual, larger than the object, and upright. (B) virtual, smaller than the object, and upright. (C) virtual, smaller than the object, and inverted. (D) real, smaller than the object, and inverted.
B. Virtual, smaller than the object, and upright.
A charged particle can move with constant velocity through a region containing both an electric field and a magnetic field only if the (A) electric field is parallel to the magnetic field (B) electric field is perpendicular to the magnetic field (C) electric field is parallel to the velocity vector (D) magnetic field is perpendicular to the velocity vector
B. electric field is perpendicular to the magnetic field
A potential difference V is maintained between two large, parallel conducting plates. An electron starts from rest on the surface of one plate and accelerates toward the other. Its speed as it reaches the second plate is proportional to (A) 1/(sqrt V) (B) sq rt V (C) V (D) V^2
B. sqrt V
A square loop of copper wire is initially placed perpendicular to the lines of a constant, uniform magnetic field of 5 x 10^-3 tesla. The area enclosed by the loop is 0.2 square meter. The loop is then turned through an angle of 90° so that the plane of the loop is parallel to the field lines. The turn takes 0.1 second. The average emf induced in the loop during the turn is (A) 1.0 x 10^-4 V (B) 2.5 x 10^-3 V (C) 0.01 V (D) 100 V
C. .01 V
Light travels from material X with an index of refraction of n=1.5 to material Y with an index of refraction of n=2.0. If the speed of light in material Y is v, what is the speed of light in material X? (A) 0.56 v (B) 0.75 v (C) 1.33 v (D) 1.78 v
C. 1.33 v
Two negative point charges are a distance x apart and have potential energy U. If the distance between the point charges increases to 3x, what is their new potential energy? (A) 9U (B) 3U (C) 1/3 U (D) 1/9 U
C. 1/3U
An object is placed 10 cm in front of the center of a concave curved mirror with a radius of curvature of 10 cm. About how far from the mirror will the real image of the object be formed? (A) 0 cm (B) 5 cm (C) 10 cm (D) 20 cm
C. 10 cm
A converging lens forms a virtual image of a real object that is two times the objects size. The converging lens is replaced with a diverging lens having the same size focal length. What is the magnification of the image formed by the diverging lens? (A) -1 (B) -2/5 (C) 2/3 (D) 3/2
C. 2/3
Two concentric circular loops of radii b and 2b, made of the same type of wire, lie in the plane of the page. The total resistance of the wire loop of radius b is R. What is the resistance of the wire loop of radius 2b? (A) R/2 (B) R (C) 2R (D) 4R
C. 2R
In Young's double slit experiment, the second order bright band of one light source overlaps the third order band of another light source. If the first light source has a wavelength of 660 nm, what is the wavelength of the second light source? A) 1320 nm B) 990 nm C) 440 nm D) 330 nm
C. 440 nm
Two parallel wires, each carrying a current I, repel each other with a force F. If both currents are doubled, the force of repulsion is (B) 2√2 F (C) 4F (C) 4√2 F (E) 8F
C. 4F
A magnet is dropped through a vertical copper pipe slightly larger than the magnet. Relative to the speed it would fall in air, the magnet in the pipe falls. A) more slowly because it is attracted by the innate magnetic field of the pipe B) more slowly because the currents induced in the pipe produce an opposing magnetic field C) at the same rate D) more quickly because the currents induced in the pipe produce an opposing magnetic field
C. At the same rate
Force magnitudes between two objects which are inversely proportional to the square of the distance between the objects include which of the following? I. Gravitational force between two celestial bodies II. Electrostatic force between two electrons III. Nuclear force between two neutrons A) I only B) III only C) I and II only D) II and III only
C. I and II only
From the electric field vector at a point, one can determine which of the following? I. The direction of the electrostatic force on a test charge of known sign at that point II. The magnitude of the electrostatic force exerted per unit charge on a test charge at that point III. The electrostatic charge at that point (A) I only (B) III only (C) I and II only (D) II and III only
C. I and II only
Observations that indicate that visible light has a wavelength much shorter than a centimeter include which of the following? I. The colored pattern seen in a soap bubble II. The colored pattern seen when light passes through a diffraction grating III. The bending of light when it passes from one medium to another medium (A) I only (B) III only (C) I and II only (D) II and III only
C. I and II only
hen two identical parallel-plate capacitors are connected in series, which of the following is true of the equivalent capacitance? (A) It depends on the charge on each capacitor. (B) It depends on the potential difference across both capacitors. (C) It is larger than the capacitance of each capacitor. (D) It is smaller than the capacitance of each capacitor.
C. It is larger than the capacitance of each capacitor
Two initially uncharged conductors, 1 and 2, are mounted on insulating stands and are in contact, as shown above. A negatively charged rod is brought near but does not touch them. With the rod held in place, conductor 2 is moved to the right by pushing its stand, so that the conductors are separated. Which of the following is now true of conductor 2? (A) It is uncharged. (B) It is positively charged. (C) It is negatively charged. (D) It is charged, but its sign cannot be predicted.
C. It is negatively charged
A proton moves toward the top of this page into a region that has a magnetic field directed to the right of this page. If the particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity. A) To the left B) Into the page C) Out of the page D) To the right
C. Out of the page
An object is located 0.20 meters from a converging lens which has a focal length of 0.15 meters. Relative to the object, the image formed by the lens will be: (A) virtual, inverted, smaller (B) real, inverted, smaller. (C) real, inverted, larger (D) virtual, upright, larger
C. Real, inverted, larger
A charged particle is projected with its initial velocity parallel to a uniform magnetic field. The resulting path is (A) a spiral (B) a circular arc (C) a straight line parallel to the field (D) a straight line perpendicular to the field
C. Straight line, parallel to field
The capacitance of a parallel-plate capacitor can be increased by increasing which of the following? (A) The distance between the plates (B) The charge on each plate (C) The area of the plates (D) The potential difference across the plates
C. The area of the plates
When a positive electrically charged glass rod is brought near a neutral hollow metal sphere suspended by an insulating string, the sphere will be attracted to the rod because: (A) the rod removes electron from the sphere (B) the electric charge produces a magnetic field to attract the sphere (C) the charge on the rod causes a separation of charge in the sphere (D) some of the protons from the rod have been given to the sphere
C. The charge on the rod causes a separation of charge in the sphere
The two plates of a parallel-plate capacitor are a distance d apart and are mounted on insulating supports. A battery is connected across the capacitor to charge it and is then disconnected. The distance between the insulated plates is then increased to 2d. If fringing of the field is still negligible, which of the following quantities is doubled? (A) The capacitance of the capacitor (B) The surface density of the charge on the plates of the capacitor (C) The energy stored in the capacitor (D) The intensity of the electric field between the plates of the capacitor
C. The energy stored in the capacitor
A person rubs a neutral comb through their hair and the comb becomes negatively charged. Which of the following is the best explanation for this phenomenon? (A) The hair gains protons from the comb. (B) The hair gains protons from the comb while giving electrons to the comb. (C) The hair loses electrons to the comb. (D) The comb loses protons to the person's hand holding the comb.
C. The hair loses electrons to the comb
A parallel-plate capacitor is connected to a battery. Without disconnecting the capacitor, a student pulls the capacitor's plates apart so that the plate separation doubles. As a result of this action, what happens to the voltage across the capacitor and the energy stored by the capacitor? (A) the voltage doubles; the energy stays the same (B) the voltage doubles; the energy halves (C) the voltage stays the same; the energy halves (D) the voltage stays the same; the energy doubles
C. The voltage stays the same; the energy halves
Two conducting cylindrical wires are made out of the same material. Wire X has twice as much resistance than wire Y. Which of the following could be true? (A) Wire X is twice the diameter of wire Y. (B) Wire X is twice as long and twice the diameter of wire Y. (C) Wire Y is twice as long and twice the diameter of wire X. (D) Wire Y is twice as long as wire X.
C. Wire Y is twice as long and twice the diameter of wire X.
In an x-ray tube, electrons striking a target are brought to rest, causing x-rays to be emitted. In a particular x-ray tube, the maximum frequency of the emitted continuum x-ray spectrum is fo. If the voltage across the tube is doubled, the maximum frequency is (A) fo/2 (B) fo/√2 (C) √2 fo (D) 2fo
C. √2 fo
A 5x10^-6 coulomb electric charge is placed midway between two parallel metal plates connected to a 9-volt battery. If the electric charge experiences a force of 1.5x10^-4 newtons, what is the separation of the metal plates? (A) 6.75 × 10^-9 m (B) 2.7 × 10^-4 m (C) 3.7 × 10^-3 m (D) 0.30 m
D. .30 m
Light that has a wavelength of 500 nm in air has a wavelength 400 nm in a transparent material. What is the index of refraction of the material? (A) 0.64 ( B) 0.80 (C) 1.00 ( D) 1.25
D. 1.25
A 12-volt storage battery, with an internal resistance of 2, is being charged by a current of 2 amperes. Under these circumstances, a voltmeter connected across the terminals of the battery will read (A) 8 V (B) 10 V (C) 12 V (D) 16 V
D. 16 V
Two small spheres have equal charges q and are separated by a distance d. The force exerted on each sphere by the other has magnitude F. If the charge on each sphere is doubled and d is halved, the force on each sphere has magnitude (A) F (B) 4F (C) 8F (D) 16F
D. 16F
Two parallel conducting plates are connected to a constant voltage source. The magnitude of the electric field between the plates is 2,000 N/C. If the voltage is doubled and the distance between the plates is reduced to 1/5 the original distance, the magnitude of the new electric field is (A) 800 N/C (B) 1,600 N/C (C) 2,400 N/C (D) 20,000 N/C
D. 20,000 N/C
A wire of resistance R dissipates power P when a current I passes through it. The wire is replaced by another wire with resistance 3R. The power dissipated by the new wire when the same current passes through it is (A) P/9 (B) P/3 (C) P (D) 3P
D. 2P
A physics student places an object 6.0 cm from a converging lens of focal length 9.0 cm. What is the magnitude of the magnification of the image produced? (A) 0.6 (B) 1.5 (C) 2.0 (D) 3.0
D. 3.0
Two identical spheres carry identical electric charges. If the spheres are set a distance d apart they repel one another with a force F. A third sphere, identical to the other two but initially uncharged is then touched to one sphere and then to the other before being removed. What would be the resulting force between the original two spheres? (A) ¾ F (B) 5/8 F (C) ½ F (D) 3/8 F
D. 3/8F
A conducting sphere of radius R carries a charge Q. Another conducting sphere has a radius R/2, but carries the same charge. The spheres are far apart. The ratio of the electric field near the surface of the smaller sphere to the field near the surface of the larger sphere is most nearly (A) 1/4 (B) 1/2 (C) 2 (D) 4
D. 4
wo conducting spheres with the same charge Q are separated by an infinite distance. Sphere A has a radius of 10 cm while sphere B has a radius of 20 cm. At what distance from the centers of the spheres would the magnitude of the electric field be the same? (A) 15 cm from A and 15 cm from B (C) 20 cm from A and 40 cm from B (B) 30 cm from A and 40 cm from B (D) 40 cm from A and 40 cm from B
D. 40 cm from A and 40 cm from B
According to the Bohr theory of the hydrogen atom, electrons starting in the 4th energy level and eventually ending up in the ground state, could produce a total of how many lines in the hydrogen spectra? A) 3 B) 4 C) 5 D) 6
D. 6
Lenz's law concerning the direction of an induced current in a conductor by a magnetic field could be considered a result of A) Ampere's law B) Ohm's Law C) Tesla's Law D) The Law of Conservation of Energy
D. Conservation of Energy
In an experiment to measure the wavelength of light using a double slit apparatus, it is found that the bright fringes are too close together to easily count them. To increase only the spacing between the bright fringes, one could A) increase the slit width B) decrease the slit width C) increase the slit separation D) decrease the slit separation
D. Decrease the slit separation
A charged particle with constant speed enters a uniform magnetic field whose direction is perpendicular to the particles velocity. The particle will: A) Speed up B) Experience no change in velocity C) Follow a parabolic arc D) Follow a circular arc
D. Follow a circular arc
Which of the following CANNOT be accomplished by a single converging lens with spherical surfaces? (A) Converting a spherical wave front into a plane wave front (B) Converting a plane wave front into a spherical wave front (C) Forming a virtual image of a real object (D) Forming a real upright image of a real upright object
D. Forming a real upright image of a real upright object
Which of the following statements is true of a beta particle? A) Its speed in a vacuum is 3 x 108 m/s. B) It is more penetrating than a gamma ray of the same energy. C) It has a mass of about 1,840 times that of a proton. D) It can exhibit wave properties.
D. It can exhibit wave properties.
A solid conducting sphere is given a positive charge Q. How is the charge Q distributed in or on the sphere? (A) It is concentrated at the center of the sphere. (B) It is uniformly distributed throughout the sphere. (C) Its density decreases radially outward from the center. (D) It is uniformly distributed on the surface of the sphere only.
D. It is uniformly distributed on the surface of the sphere only
The emf of a battery is 12 volts. When the battery delivers a steady current of 0.5 ampere to a load, the potential difference between the terminals of the battery is 10 volts. What terminal voltage would you expect if the battery were connected to a load with less resistance? (A) 12 V (B) 10 V (C) Between 10 and 12 V (D) Less than 10 V
D. Less than 10 V
If the object distance for a converging thin lens is more than twice the focal length of the lens, the image is (A) virtual and erect (B) larger than the object (C) located inside the focal point (D) located at a distance between f and 2f from the lens
D. Located at a distance between f and 2f from the lens
A parallel-plate capacitor is charged by connection to a battery. If the battery is disconnected and the separation between the plates is increased, what will happen to the charge on the capacitor and the voltage across it? (A) Both remain fixed. (B) Both increase. (C) The charge increases and the voltage decreases. (D) The charge remains fixed and the voltage increases.
D. The charge remains fixed and the voltage increases
A sound wave generated from a tuning fork of single frequency travels from air (with speed of sound 340 m/s) into rock (with speed of sound 1500 m/s). Which statement is true about the wavelength and frequency of the sound as it passes from air to rock? A) The frequency of the sound increases and the wavelength increases. B) The frequency of the sound increases and the wavelength is unchanged. C) The frequency of the sound is unchanged and the wavelength is decreased. D) The frequency of the sound is unchanged and the wavelength is increased.
D. The frequency of the sound is unchanged and the wavelength is increased.
A large lens is used to focus an image of an object onto a screen. If the left half of the lens is covered with a dark card, which of the following occurs (A) The left half of the image disappears (B) The right half of the image disappears (C) The image becomes blurred (D) The image becomes dimmer
D. The image becomes dimmer
For which of the following does one obtain an image of increased size from a real object? Take all focus and radius of curvature values as positive. (A) The object is placed at a position outside the radius of curvature for a converging lens. (B) The object is placed at a position outside the radius of curvature for a diverging lens. (C) The object is placed at a position inside the magnitude of the focus for a concave lens. (D) The object is placed at a position between the focus and radius of curvature for a concave mirror.
D. The object is placed at a position between the focus and radius of curvature for a concave mirror.
Two large parallel plates a distance d apart are charged by connecting them to a battery of potential difference V. The battery is disconnected, and the plates are slowly moved apart. As the distance between plates increases: (A) the charge on the plates decreases. (B) the electric field intensity between the plates increases. (C) the potential difference between the plates decreases. (D) the potential difference between the plates increases.
D. The potential difference between the plates increases
A scientist claims to have perfected a technique in which he can spontaneously convert an electron completely into energy in the laboratory without any other material required. What is the conclusion about this claim from our current understanding of physics? A) This is possible because Einstein's equation says that mass and energy are equivalent... it is just very difficult to achieve with electrons B) This is possible and it is done all the time in the high-energy physics labs. C) The scientist is almost correct... except that in converting the electron to energy, an electron's anti-particle is produced in the process as well. D) This is not possible because charge conservation would be violated.
D. This is not possible because charge conservation would be violated.
An illuminated object is placed 0.30 meter from a lens whose focal length is -0.15 meter. The image is (A) inverted, real, and 0.30 meter from the lens on the opposite side from the object (B) upright, virtual, and 0.30 meter from the lens on the opposite side from the object (C) upright, real, and 0.10 meter from the lens on the same side as the object (D) upright, virtual, and 0.10 meter from the lens on the same side as the object
D. Upright, virtual, and 0.10 meter from the lens on the same side as the object
A physics problem starts: "A solid sphere has charge distributed uniformly throughout. . . " It may be correctly concluded that the (A) electric field is zero everywhere inside the sphere (B) electric potential on the surface of the sphere is not constant (C) electric potential in the center of the sphere is zero (D) sphere is not made of metal
D. sphere is not made of metal
An electron moves through a uniform magnetic field. The force on the electron is greatest when it moves (parallel / perpendicular) at a (fast / slow) velocity.
perpendicular; fast
