Physics 112 Final

When light enters glass from air. The angle of refraction will be equal to the angle of incidence.

False

Light waves passing through a circular aperture spread out to generate a circular diffraction pattern.

True

The amount of current in a circuit depends jointly on the battery's emf and the resistance of the circuit attached to the battery

True

The direction of the force on a current carrying wire in a magnetic field is perpendicular to both the current and the magnetic field

True

The following sets of characteristics describes the image formed by a plane mirror? A virtual and upright image.

True

The fundamental charge (e) is the magnitude of the charge of an electron or proton:e= 1.60 x10−19C.

True

The induced current generates its own magnetic field. This induced magnetic field opposes the change in flux.

True

The resistivity of a material increases as the temperature goes up.

True

When a current flows through a metal wire, the moving charges are electrons

True

A 1.4-cm tall flower is 4.0 cm from a spherical concave mirror. If the image of the flower is 4.0 cm tall, how far is the image from the mirror? A) 11 cm B) 9.4 cm C) 1.4 cm D) 0.090 cm

A

Red light with a wavelength of 650 nm travels from air into a liquid with an index of 1.33. What are the frequency and wavelength of the light in the liquid? (c = 3.0 × 108 m/s)

4.61 x 10^14 Hz, 489 nm

When red light illuminates a grating with 7000 lines per centimeter, its second maximum is at 62.4°. What is the wavelength of this light?

633 nm

A beam of monochromatic light passes through a slit that is 11.0 μm wide. If the first order dark fringe of the resulting diffraction pattern is at an angle of 4.31° away from the centerline, what is the wavelength of light? A) 827 nm B) 301 nm C) 602 nm D) 402 nm E) 201 nm

A

A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus? A) 0.10 A B) 0.60 A C) 1.0 A D) 6.0 A

A

A cordless phone operates at 900 MHz. What is the wavelength of the electromagnetic wave used by this phone? (c= 3.0 x 10^8 m/s) A) .33 m B) 3.3 m C) 3.3 mm

A

A hydrogen atom consists of a proton and an electron. If the orbital radius of the electron increases, the electric potential energy of the electron due to the proton A) increases. B) decreases. C) remains the same. D) depends on the zero point of the potential.

A

A light ray in glass arrives at the glass-water interface at an angle of θ = 48° with the normal. The refracted ray in water makes an angle θ = 61° with the normal, as shown in the figure. The index of refraction of water is 1.33. The angle of incidence is now changed to θ = 25°. What is the new angle of refraction φ in the water? A) 30° B) 56° C) 54° D) 60° E) 62°

A

A radio transmitter is operating at an average power of 4.00 kW and is radiating uniformly in all directions. What is the average intensity of the signal 8.0 km from the transmitter? A) 4.97 uW/m^2 B) 2.49 uW/m^2 C) 0.00497 W/m^2 D) 0.00249 W/m^2

A

An electronic component with a 17-Ω resistor is rated for use at power levels not exceeding 14W. How much current can safely flow through the component? A) 0.91 A B) 1.21 A C) 238 A D) 0.22 A

A

Four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge? A) A B) B C) C D) D

A

Four, unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination? A) The equivalent resistance is less than that of the smallest resistor B) The equivalent resistance is equal to the average of the four resistances C) The equivalent resistance is midway between the largest and smallest resistance D) The equivalent resistance is more than the largest resistance E) None of the other choices is correct

A

How far from a lens having a focal length of +50 mm must the object be placed if it is to form a virtual image that is 3.0 times the size of the object? A) 33 mm B) 42 mm C) 48 mm D) 54 mm

A

In a two-slit experiment, monochromatic coherent light of wavelength 600 nm passes through a pair of slits separated by 2.20 x m. At what angle away from the centerline does the first bright fringe occur? A) 1.56° B) 2.22° C) 3.12° D) 4.70° E) 6.24°

A

Light goes from material having a refractive index of n1 into a material with refractive index n2. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction? A) n1 > n2 B) n1 ≥ n2 C) n1 < n2 D) n1 ≤ n2 E) n1 = n2

A

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6Ω ∙ m. The toaster is designed to operate at a voltage of 120 V. How much power does it draw in normal operation? A) 370 W B) 360 W C) 380 W D) 400 W E) 410 W

A

Two electrons are 20.00 mm apart at closest approach. What is the magnitude of the maximum electric force that they exert on each other A) 5.8 ×10-25 N B) 2.3 ×1010N C) 2.3 N D) 5.8 ×10-27 N

A

Light having a speed in vacuum of 3.0 × 108 m/s enters a liquid of refractive index 2.0. In this liquid, its speed will be A) 6.0 × 108 m/s B) 3.0 × 108 m/s C) 1.5 × 108 m/s D) 0.75 × 108 m/s E) 0.67 × 108 m/s

C

A coil lies flat on a level tabletop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases? A) counterclockwise B) clockwise C) clockwise initially, then counterclockwise before stopping D) there is no induced current in this coil

B

A proton having a speed of 3.0 x 10^6 m/s in a direction perpendicular to a uniform magnetic field moves in a circle of radius 0.20 m within the field. What is the magnitude of the magnetic field? A) 0.080 T B) 0.16 T C) 0.24 T D) 0.32 T E) 0.36 T

B

An oil layer that is 5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. A light ray from the air above enters the oil at 45° with the normal and then goes into the water. What is the angle of refraction of this ray in the water? The index of refraction for the oil is 1.15, and for water it is 1.33. A) 27° B) 32° C) 36° D) 39°

B

An upright object is 50 cm from a concave mirror of radius 60 cm. The character of the image is A) real and upright B) real and inverted C) virtual and upright D) virtual and inverted

B

Kirchhoff's junction rule is a statement of A) the law of conservation of momentum B) the law of conservation of charge C) the law of conservation of energy D) the law of conservation of angular momentum E) Newton's second law

B

Light having a frequency in vacuum of 6.0 × 1014 Hz enters a liquid of refractive index 2.0. What is the frequency of the light in this liquid? (c = 3.0 × 108 m/s) A) 12 × 1014 Hz B) 6.0 × 1014 Hz C) 3.0 × 1014 Hz D) 1.5 × 1014 Hz E) 2.0 × 1014 Hz

B

Suppose you have two capacitors and want to use them to store the maximum amount of energy by connecting them across a voltage source. You should connect them A) in series across the source B) in parallel across the source C) it doesn't matter because stored energy is the same either way

B

The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field between the plates during this process? A) It increases. B) It decreases. C) It remains constant. D) It cannot be determined from the information given

B

Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum destructive interference is to occur at point P, the two beams must travel paths that differ by A) a whole number of wavelengths. B) an odd number of half-wavelengths. C) a whole number of half-wavelengths.

B

A very long straight current carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of A) 16d B) 8d C) 4d D) 2d E) d(sqrroot)2

C

An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (u0=4pi x 10^-7 T * m/A) A) 16 mT B) 4.9 mT C) 15 mT D) 6.0 mT E) 9.0 mT

C

How much energy is carried by a photon of light having frequency 110 GHz? A) 1.1 x 10^-20 J B) 1.4 x 10^-22 J C) 7.3 x 10^-23 J D) 1.3 x 10^-25 J

C

If a single lens forms a virtual image of an object, then A) the lens must be a diverging lens. B) the lens must be a converging lens. C) the lens could be either a diverging or a converging lens. D) the image must be inverted. E) the object must be between the lens and its focal point.

C

In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe in the resulting diffraction pattern? A) It stays the same. B) It becomes narrower. C) It becomes wider.

C

Is it possible to see a virtual image? A) No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. B) No, since virtual images do not really exist. C) Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object. D) Yes, but only by using an additional lens to form a real image before the light reaches the eye.

C

Light of wavelength 610 nm is incident on a slit 0.20 mm wide and the diffraction pattern is viewed on a screen that is 1.5 m from the slit. What is the width on the screen of the central maximum? A) 0.34 cm B) 0.68 cm C) 0.92 cm D) 1.2 cm E) 1.5 cm

C

The distance between two slits is 1.50 × m. A beam of coherent light of wavelength 600 nm illuminates these slits, and the distance between the slit and the screen is 2.00 m. What is the distance on the screen between the central bright fringe and the fourth-order bright fringe? A) 0.132 m B) 0.201 m C) 0.324 m D) 0.528 m E) 0.688 m

C

The maximum torque on a flat current carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is A) 0 degrees B) 45 degrees C) 90 degrees D) 135 degrees

C

What principle is responsible for light spreading as it passes through a narrow slit? A) refraction B) polarization C) diffraction D) dispersion

C

When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its frequency A) increases by a factor of 3/2. B) is reduced to 2/3 its original value. C) is unaffected.

C

A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image located? A) 12 cm behind the mirror B) 12 cm in front of the mirror C) 60 cm behind the mirror D) 60 cm in front of the mirror

D

An ideal parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the distance between the plates is halved, what is the new capacitance? A) C/4 B) C/2 C) 2C D) 4C

D

An object is placed in front of a convex mirror at a distance larger than twice the magnitude of the focal length of the mirror. The image will appear A) in front of the mirror. B) inverted and reduced. C) inverted and enlarged. D) upright and reduced. E) upright and enlarged.

D

At a distance d from a point charge Q, the energy density in its electric field is u. If we now go to a distance d/2 from the charge, what is the energy density at the new location? A) 16u B) 8u C) 4u D) 2u E) u(sqrroot)2

D

Three capacitors are connected as shown in the figure. What is the equivalent capacitance between points A and B? A) 12 uF B) 4.0 uC C) 7.1 uF D) 1.7 uF E) 8.0 uF

D

Two stationary point charges q1 and q2 are shown in the figure along with a sketch of some field lines representing the electric field produced by them. What can you deduce from the sketch? A) q1 is negative and q2 is positive; the magnitudes are equal. B) q1 and q2 have the same sign; the magnitudes are equal. C) q1 is positive and q2 is negative; the magnitude of q 1 is greater than the magnitude of q2 D) q1 is negative and q2 is positive; the magnitude of q 1 is less than the magnitude of q2 E) q1 and q2 have the same sign; the magnitude of q1 is greater than the magnitude of q2

D

When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced? A) 0.4 B) 1/4 C) 2 D) 4 E) None of the other choices is correct.

D

Which one of the following is not an electromagnetic wave? A) ultraviolet B) infrared C) radio waves D) sound waves E) gamma waves

D

Which statement about a single thin lens is correct? A) A converging lens always produces a real inverted image. B) A diverging lens always produces a virtual inverted image. C) A converging lens sometimes produces a real upright image. D) A diverging lens always produces a virtual upright image. E) A diverging lens produces a virtual upright image only if the object is located between the lens and its focal point.

D

X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with each other. A positively charged rod R is brought close to X as shown in part (a) of the figure. Sphere Y is now moved away from X, as shown in part (b). What are the final charge states of X and Y? A) Both X and Y are neutral. B) X is positive and Y is neutral. C) X is neutral and Y is positive. D) X is negative and Y is positive. E) Both X and Y are negative

D

Monochromatic coherent light shines through a pair of slits. If the distance between these slits is decreased, which of the following statements are true of the resulting interference pattern? (There could be more than one correct choice.) A) The distance between the maxima stays the same. B) The distance between the maxima decreases. C) The distance between the minima stays the same. D) The distance between the minima increases. E) The distance between the maxima increases.

D,E

A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image? A) The image is real, 2.5 cm tall, 30 cm on the same side as object. B) The image is virtual, 2.5 cm tall, 30 cm on the other side of the lens. C) The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens. D) The image is virtual, 4.0 cm tall, 60 cm on the same side as object. E) The image is real, 4.0 cm tall, 60 cm on the other side of the lens.

E

A beam of light in water (of refractive index of 1.33) enters a glass slab (of refractive index 1.50) at an angle of incidence of 60.0°. What is the angle of refraction in the glass? A) 27.5° B) 39.8° C) 60.0° D) 90.0° E) 50.2°

E

An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm. How tall is the image? A) 2.5 cm B) 5.0 cm C) 7.5 cm D) 20.0 cm E) 10.0 cm

E

An object that is 4.00 cm tall is placed 18.0 cm in front of a concave mirror having a focal length of 20.0 cm. What is the location of its image in relation to the mirror and what are its characteristics? A) 180 cm on the other side of mirror, real, 6.00 times bigger B) 10 cm on the other side of mirror, virtual, 10.0 times bigger C) 18 cm on the same side of mirror, virtual, 2.25 times bigger D) 20 cm on the same side of mirror, real, 10.0 times bigger E) 180 cm on the other side of mirror, virtual, 10.0 times bigger

E

Four resistors having resistances of 20Ω, 40Ω, 60Ω, and 80Ω, are connected in series across an ideal dc voltage source. If the current through this circuit is 0.50 A, what is the voltage of the voltage source? A) 20 V B) 40 V C) 60 V D) 80 V E) 100 V

E

In a two-slit experiment, monochromatic coherent light of wavelength 600 nm passes through a pair of slits separated by 2.20 × 10-5 m. At what angle away from the centerline does the second dark fringe occur? A) 4.70° B) 3.51° C) 3.94° D) 1.17° E) 2.34°

E

Light travels from crown glass, with a refractive index of 1.52, into water, having a refractive index of 1.33? The critical angle for this interface is closest to which one of the following angles? A) 42° B) 48° C) 53° D) 57° E) 61°

E

Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. What are the signs of the charges of these three particles? A) 1 is neutral, 2 is negative, and 3 is positive B) 1 is neutral, 2 is positive, and 3 is negative C) 1 is positive, 2 is neutral, and 3 is negative D) 1 is positive, 2 is negative, and 3 is neutral E) 1 is negative, 2 is neutral and 3 is positive

E

Two thin slits are 6.00 μm apart. Monochromatic coherent light falls on these slits, and produces multiple slits bright interference fringe at an angle of 32.3° away from the centerline. What is the wavelength of the light? A) 164 nm B) 416 nm C) 614 nm D) 641 nm E) 676 nm

E

We observe that a moving charged particle experiences no magnetic force. From this, we can definitely conclude that no magnetic field exists in that region of space

False

A compass points north because that is the Earth's, north magnetic pole

False

A concave mirror focuses the light rays.

False

A laboratory experiment produces a double-slit interference pattern on a screen. If the screen is moved farther away from the slits, the fringes will be Fuzzy and out of focus.

False

Doubling the capacitance of a capacitor that is holding a constant charge causes the energy stored in that capacitor to double.

False

For capacitors in series, the voltage across each capacitor is the same

False

If the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will increase by a factor of two (2).

False

In an electromagnetic wave in free space, the electric and magnetic fields are parallel to one another and perpendicular to the direction of wave propagation

False

Light in a frozen block of ice reflects off the ice-air interface at the surface of the block. The phase shift it undergoes is 270°?

False

Light or any EM wave can only be modeled as a particle

False

Single concave spherical mirrors produce images that are always smaller than the actual object.

False

The Electric Field inside of charged parallel plate capacitor is not uniform.

False

The electron volt eV is a unit of power.

False

The length of a certain wire is kept the same while its radius is doubled. The resistance of this wire does not change.

False

This dipole in a uniform Electric Field will not move.

False

Two identical bulbs in a series will not have the same brightness

False

Two long parallel wires are placed side by side on a horizontal table. If the wires carry current in the opposite direction, the wires will be attracted towards each other

False

Two long parallel wires placed side by side on a horizontal table carry identical current straight towards you. From your point of view, the magnetic field at a point exactly between the two wires points upward

False

Two protons are released from rest, with only the electrostatic force acting, their acceleration will keep increasing.

False

A capacitor stores separated charges and has a potential difference, but it has no emf.

True

A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. The electric field between the plates as the dielectric is inserted will become weaker.

True

A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Is it true that the electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus

True

A negative magnification for a mirror means that the image is inverted, and the mirror is concave.

True

Any kind of wave spreads out after passing through a small enough gap in a barrier. This phenomenon is known as diffraction.

True

As more resistors are added in parallel across a constant voltage source, the power supplied by the source increases

True

Diffraction is the principle that is responsible for light spreading as it passes through a narrow slit?

True

Electrically neutral objects cannot exert an electrical force on each other

True

For a beam of light, the direction of polarization is defined as the direction of the electric field's vibration

True

For different resistors in parallel the current through each resistors is not the same

True

According to Lenz's law, the induced current in a circuit always flows to opposite the external magnetic flux through the circuit

false