Question 1

Plane waves incident upon a barrier that pass through a small opening

Accepted Answer

A) continue as plane waves. 
B) fan out. 
C) converge. 
D) become polarized. 
E) all of the above 
A) continue as plane waves. 
B) fan out. 
C) converge. 
D) become polarized. 
E) all of the above

Question 2

When waves from a pair of closely-spaced slits arrive out of phase

Accepted Answer

A) a bright fringe is produced. 
B) a dark fringe is produced. 
C) both bright and dark fringes are produced. 
D) none of the above 
A) a bright fringe is produced. 
B) a dark fringe is produced. 
C) both bright and dark fringes are produced. 
D) none of the above

Question 3

Which of the following is a property of light waves and NOT of sound waves?

Accepted Answer

A) frequency 
B) wavelength 
C) amplitude 
D) polarization 
E) none of the above 
A) frequency 
B) wavelength 
C) amplitude 
D) polarization 
E) none of the above

Question 4

The vibrational direction of an electron and the plane of polarization of the light it emits

Accepted Answer

A) are the same. 
B) are at right angles to each other. 
C) may or may not be at right angles to each other. 
D) are independent of each other. 
A) are the same. 
B) are at right angles to each other. 
C) may or may not be at right angles to each other. 
D) are independent of each other.

Question 5

Superposition of waves can produce

Accepted Answer

A) reinforcement. 
B) cancellation. 
C) partial cancellation. 
D) all the above 
A) reinforcement. 
B) cancellation. 
C) partial cancellation. 
D) all the above

Question 6

Interference effects are less visible for thick films because the reflected waves

Accepted Answer

A) from the bottom surface are too dim. 
B) become too dispersed. 
C) are out of phase with one another. 
D) are too displaced to interfere. 
A) from the bottom surface are too dim. 
B) become too dispersed. 
C) are out of phase with one another. 
D) are too displaced to interfere.

Question 7

Interference colors in a soap bubble is evidence that the soap film

Accepted Answer

A) has two reflecting surfaces. 
B) is thin. 
C) both of these 
D) neither of these 
A) has two reflecting surfaces. 
B) is thin. 
C) both of these 
D) neither of these

Question 8

Polarization is a property of

Accepted Answer

A) transverse waves. 
B) longitudinal waves. 
C) both of these 
D) neither of these 
A) transverse waves. 
B) longitudinal waves. 
C) both of these 
D) neither of these

Question 9

The production of interference colors requires

Accepted Answer

A) a reflecting surface. 
B) at least two reflecting surfaces. 
C) a medium with a relatively low index of refraction. 
D) none of the above 
A) a reflecting surface. 
B) at least two reflecting surfaces. 
C) a medium with a relatively low index of refraction. 
D) none of the above

Question 10

The polarization axes of glasses for 3-D viewing are

Accepted Answer

A) vertical. 
B) horizontal. 
C) at right angles to each other. 
A) vertical. 
B) horizontal. 
C) at right angles to each other.

Question 11

For radio reception in city buildings, diffraction is

Accepted Answer

A) helpful. 
B) a hindrance. 
C) not a factor. 
A) helpful. 
B) a hindrance. 
C) not a factor.

Question 12

Waves diffract the most when their wavelength is

Accepted Answer

A) short. 
B) long. 
C) both of these 
D) neither of these 
A) short. 
B) long. 
C) both of these 
D) neither of these

Question 13

Iridescent colors in the pearly luster of an abalone shell are due to

Accepted Answer

A) refraction. 
B) diffraction. 
C) dispersion. 
D) polarization. 
E) interference. 
A) refraction. 
B) diffraction. 
C) dispersion. 
D) polarization. 
E) interference.

Question 14

The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a classroom Polaroid filter is

Accepted Answer

A) less than half. 
B) more than half. 
C) half. 
A) less than half. 
B) more than half. 
C) half.

Question 15

A thin film appears cyan when illuminated with white light. The color being cancelled by destructive interference is

Accepted Answer

A) red. 
B) green. 
C) white. 
D) blue. 
E) none of the above 
A) red. 
B) green. 
C) white. 
D) blue. 
E) none of the above

Question 16

Magnification can be accomplished with a hologram when viewed with light that has a

Accepted Answer

A) longer wavelength than the original light. 
B) shorter wavelength than the original light. 
C) neither for holograms cannot be magnified. 
A) longer wavelength than the original light. 
B) shorter wavelength than the original light. 
C) neither for holograms cannot be magnified.

Question 17

Light emitted by the Sun is

Accepted Answer

A) polarized. 
B) nonpolarized. 
C) sometimes polarized. 
A) polarized. 
B) nonpolarized. 
C) sometimes polarized.

Question 18

Diffraction is evident when a wave passes

Accepted Answer

A) through a small opening. 
B) the edge of an object. 
C) both of these 
D) neither of these 
A) through a small opening. 
B) the edge of an object. 
C) both of these 
D) neither of these

Question 19

The superposition of identical waves affects

Accepted Answer

A) amplitude. 
B) wavelength. 
C) speed. 
D) all of the above 
E) none of the above 
A) amplitude. 
B) wavelength. 
C) speed. 
D) all of the above 
E) none of the above

Question 20

Because of absorption, a Polaroid will actually transmit 40% of incident unpolarized light. Two such Polaroids with their axes aligned will transmit

Accepted Answer

A) 0%. 
B) 40%. 
C) 100%. 
D) between 0% and 40%. 
E) between 40% and 100%. 
A) 0%. 
B) 40%. 
C) 100%. 
D) between 0% and 40%. 
E) between 40% and 100%.

Exam 29: Light Waves

Plane waves incident upon a barrier that pass through a small opening

When waves from a pair of closely-spaced slits arrive out of phase

Which of the following is a property of light waves and NOT of sound waves?

The vibrational direction of an electron and the plane of polarization of the light it emits

Superposition of waves can produce

Interference effects are less visible for thick films because the reflected waves

Interference colors in a soap bubble is evidence that the soap film

Polarization is a property of

The production of interference colors requires

The polarization axes of glasses for 3-D viewing are

For radio reception in city buildings, diffraction is

Waves diffract the most when their wavelength is

Iridescent colors in the pearly luster of an abalone shell are due to

The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a classroom Polaroid filter is

A thin film appears cyan when illuminated with white light. The color being cancelled by destructive interference is

Magnification can be accomplished with a hologram when viewed with light that has a

Light emitted by the Sun is

Diffraction is evident when a wave passes

The superposition of identical waves affects

Because of absorption, a Polaroid will actually transmit 40% of incident unpolarized light. Two such Polaroids with their axes aligned will transmit

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