Physics Chapter 29 - Light Waves (Exam 2)

According to Huygens' principle, every point on a wave

A) is a different source

B) is the superposition of every other part of the wave

C) behaves as a source of new waves

D) all of the above

E) none of the above

C

Secondary wavelets spread from a wave with

A) reduced speed

B) an unchanging speed

C) an increased speed

D) none of the above

B, secondary waves spread out in all directions with a speed equal to the speed of propagation

Huygens' principle applies mainly to

A) refraction of waves in a medium

B) reflection of waves

C) both of these

D) neither of these

C

The fanning out of waves upon passing through an opening is more pronounced through

A) large openings

B) small openings

C) same for each

D) none of the above

B

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

A) become polarized

B) fan out

C) converge

D) continue as plane waves

E) all of the above

B

Diffraction is most closely related to

A) dispersion

B) polarization

C) refraction

D) reflection

E) interference

E

Diffraction from foghorns is the best if the waves being diffracted are

A) long

B) short

C) either of these

D) neither of these

A

Diffraction is evident when a wave passes

A) through a small opening

B) the edge of an object

C) both of these

D) neither of these

C

What can exist in the same place at the same time?

A) two waves

B) two tiny boulders

C) two large boulders

D) all of the above

E) none of the above

A

Waves diffract the most when their wavelength is

A) long

B) short

C) both of these

D) neither of these

A

Radio waves that diffract more around small buildings are

A) AM

B) FM

C) both diffract equally

A

A dolphin perceives greater detail by emitting sounds of

A) greater speed

B) lower frequency

C) greater intensity

D) higher frequency

E) none of the above

D

For viewing tiny objects in microscope, diffraction is

A) not a factor

B) helpful

C) a hindrance

C

For radio reception in city buildings, diffraction is

A) not a factor

B) helpful

C) a hindrance

B

A razor blade nicely shows diffraction fringes when illuminated with

A) monochromatic light

B) sunlight

C) ultraviolet light

D) all of the above

E) none of the above

A

The device that spreads light into its component colors in a spectroscope is a

A) diffraction grating

B) prism

C) either of these

D) neither of these

C

Diffraction is least when illumination is with

A) red light

B) blue light

C) an electron beam

D) none of the above

C

Superposition of waves can produce

A) cancellation

B) partial cancellation

C) reinforcement

D) all of the above

A

The superposition of identical waves affects

A) speed

B) amplitude

C) wavelength

D) all of the above

E) none of the above

B

Interference is a property of

A) water waves

B) sound waves

C) light waves

D) all of the above

E) none of the above

D

Monochromatic light is light of a single

A) wavelength

B) frequency

C) color

D) all of the above

E) none of the above

D

Thomas Young's two-source interference patterns demonstrate the

A) particle nature of light

B) wave nature of light

C) both of these

D) neither of these

B

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

A) both bright and dark fringes are produced

B) a bright fringe is produced

C) a dark fringe is produced

D) none of the above

B

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

A) both bright and dark fringes are produced

B) a bright fringe is produced

C) a dark fringe is produced

D) none of the above

C

Newton's rings illustrate

A) refraction

B) dispersion

C) polarization

D) interference

E) reflection

D

Newton's rings will be closer together if illuminated with

A) blue light

B) white light

C) red light

D) none of the above

A

Light from two closely-spaced stars cannot produce a steady interference pattern due to

A) their non-point like natures

B) the inherent instability of the atmosphere

C) their different racial distances

D) incoherence

E) closely spaced start not producing interference patterns

D

Successive bright fringes in an interference pattern result from

A) equal-length distances from the slits

B) destructive interference

C) distance from the slits successively increasing one wavelength at a time

D) none of the above

C

In the double-slit experiment, fringes are more widely spaced when illumination is with monochromatic

A) high-frequency light

B) polarized light

C) low-frequency light

D) none of the above

C

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

A) diffraction

B) dispersion

C) polarization

D) refraction

E) interference

E

Colors seen when gasoline forms a thin film on water illustrate

A) diffraction

B) dispersion

C) polarization

D) refraction

E) interference

E

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

A) is thin

B) has two reflecting surfaces

C) both of these

D) neither of these

C

When long-wavelength light is seen in the interference colors of a soap bubble, the wavelength being cancelled is relatively

A) short

B) long

C) neither of these

A

When you view color in a soap film with sunlight in back of you, a friend on the other side of the soap film likely sees

A) only your head

B) a different color

C) the same color

B

Consider the interference colors in a film of gasoline on a wet street. The water provides a

A) chemical bond with the gasoline

B) means of spreading the gasoline into a thin film

C) means of slowing the rapid evaporation of gasoline

D) second reflecting surface

E) all of the above

D

The production of interference colors requires

A) a medium with a relatively low index of refraction

B) a reflecting surface

C) at least two reflecting surfaces

D) none of the above

D

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

A) green

B) white

C) blue

D) red

E) none of the above

C

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

A) green

B) white

C) red

D) blue

E) none of the above

C

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

A) white

B) blue

C) red

D) green

E) none of the above

D

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

A) are out of phase with one another

B) are too displaced to interfere

C) from the bottom surface are too dim

D) become too dispersed

B

Polarization is a property of

A) longitudinal waves

B) transverse waves

C) both of these

D) neither of these

B

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

A) wavelength

B) amplitude

C) polarization

D) frequency

E) none of the above

C

An inventor proposes to equip an office with a polarized source of background music and polarizing earplugs for non-listeners. His idea is

A) a good one that provides personal choice

B) nonsense because sound cannot be polarized

C) too expensive

D) bothersome

B

Some double-pane airplane windows darken when the inner pane is rotated. The panes are

A) thin films

B) optical fibers

C) Polaroid filters

C

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

A) are the same

B) may or may not be at right angles to each other

C) are at right angles to each other

D)are independent of each other

A

Light travels through non-cubic transparent crystals

A) without refracting

B) in mutually perpendicular directions

C) and becomes polarized in the process

D) at different speeds along different optic axes

E) none of the above

D

Light emitted by the sun is

A) nonpolarized

B) polarized

C) sometimes polarized

A

The glare seen from water is largely

A) horizontally polarized

B) unpolarized

C) vertically polarized

A

Polaroid sunglasses reduce much glare by polarization axes that are

A) horizontal

B) at right angles to each other

C) vertical

C

Three-dimensional viewing normally involves

A) an ability to see 'around' things

B) two-eyed vision

C) parallax

D) all of the above

E) none of the above

D

Parallax is evident when you view objects

A) with one or both eyes

B) in a completely dark room

C) with one eye

D) with both eyes

D

The polarization axes of glasses for 3-D viewing are

A) vertical

B) at right angles to each other

C) horizontal

B

A painting looks less flat when viewed with

A) Polaroid glasses

B) one eye

C) both eyes

B

Light will NOT pass through a pair of Polaroids when their axes are

A) perpendicular

B) 45 degrees to each other

C) parallel

D) all of the above

E) none of the above

A

Light will pass through a pair of Polaroids when their axes are

A) 45 degrees to each other

B) parallel

C) either of these

D) neither of these

C

For a pair of Polaroids with axes at 45 degrees to each other

A) light will not pass

B) another Polaroid is necessary for any light to pass

C) light that passes is dimmer than for a parallel orientation

C

A pair of crossed Polaroids will transmit light

A) that itself is polarized

B) of sufficiently long wavelengths

C) if a third Polaroid at about 45 degrees is inserted between the two

C

An ideal Polaroid will transmit 50% of incident sunlight. How much light will be transmitted by two ideal Polaroids oriented with their axes parallel to each other?

A) 0%

B) 50%

C) 100%

D) Between 0% and 50%

E) Between 50% and 100%

B

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) more than half

B) half

C) less than half

C

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

A) 0%

B) 40%

C) 100%

D) between 0% and 40%

E) between 40% and 100%

D

Three-dimensional viewing was popular in the past with slide projectors. If the slides for left and right positions in the stereo projector are duplicates of each other

A) no depth can be seen

B) depth can be seen

C) only parallax can be seen

A

The function of polarizing filters in viewing 3-D slides or movies is to provide each eye

A) a balanced intensity

B) the ability to see parallax

C) an independent left or right-eye view

D) with light polarized at right angles to each other

E) a stereoscopic view

C

Holograms employ the principle of

A) interference

B) diffraction

C) both of these

D) neither of these

C

A hologram is simply a

A) complex diffraction grating

B) thin sheet if non-cubic transparent crystals

C) pair of semi-crossed polarization filters

D) thin photographic film with microscopic images over the entire surface

E) none of the above

A

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

A) shorter wavelength than the original light

B) longer wavelength than the original light

C) neither for holograms cannot be magnified

B

A double-slit arrangement produces interference fringes for yellow sodium light. To produce narrower-spaced fringes, should red light or blue light be used?

A) red light

B) blue light

B

Light illuminates two closely spaced thin slits and produces an interference pattern on a screen behind. For which color of light - yellow or green - will the distance between the fringes be greater?

A) green

B) yellow

B