Chapter 26: Properties of Light Flashcards

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1
Q

Most of the waves in the electromagnetic spectrum are: a) gamma rays; b) infrared light; c) green light; d) not visible to the human eye; e) microwaves.

A

d) not visible to the human eye.

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2
Q

The fact that light travels at 300,000 km/s is a consequence of: a) electromagnetic wave propagation; b) electromagnetic field induction; c) Maxwell’s laws; d) energy conservation.

A

d) energy conservation.

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3
Q

Which of these electromagnetic waves has the shortest wavelength: a) radio waves; b) infrared waves; c) X-rays; d) ultraviolet waves; e) light waves.

A

c) X-rays.

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4
Q

Which of the following is fundamentally different from the others: a) sound waves; b) X-rays; c) gamma rays; d) light waves; e) radio waves.

A

a) sound waves.

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5
Q

Infrared waves are often called heat waves because they: a) emanate from relatively hot sources; b) consist of frequencies lower than those of visible light; c) induce resonance in molecules and increase internal energy in a substance; d) are absorbed rather than reflected by the skin; e) infrared is hard to pronounce.

A

c) induce resonance in molecules and increase internal energy in a substance.

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6
Q

Visible light radiation travels fastest in: a) air; b) vacuum; c) water; d) glass; e) diamond.

A

b) vacuum.

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7
Q

Color vision and detail are perceived with: a) the rods; b) the cones; c) the macula; d) the cornea; e) the pupilometric.

A

b) the cones.

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8
Q

Which of the following electromagnetic waves have the highest frequency: a) microwaves; b) X-rays; c) infrared; d) visible light; e) gamma rays.

A

e) gamma rays.

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9
Q

Glass is transparent to

A

all visible light.

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10
Q

The atmosphere is transparent to

A

visible light, some ultraviolet light, and some infrared light.

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11
Q

A solar eclipse occurs when the: a) sun passes into Earth’s shadow; b) moon passes into the Earth’s shadow; c) the moon’s shadow touches Earth.

A

c) the moon’s shadow touches Earth.

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12
Q

The cones in the retina of the eye are: a) most densely packed at the center of vision; b) uniformly spread along the visual field; c) concentrated along the periphery of vision.

A

a) most densely packed at the center of vision.

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13
Q

The moon would be at its fullest just before the time of a: a) solar eclipse; b) lunar eclipse; c) both of these; d) none of these.

A

b) lunar eclipse

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14
Q

Compared to ultraviolet waves, the wavelength of infrared waves is: a) shorter. b) longer; c) the same.

A

b) longer.

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15
Q

Materials generally become warmer when light is: a) absorbed by them; b) reflected by them; c) transmitted by them; d) all of these; e) none of these.

A

a) absorbed by them.

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16
Q

The main difference between a radio wave and a sound wave is their different: a) frequencies; b) wavelengths; c) energies; d) amplitudes; e) modes of travel.

A

e) modes of travel.

17
Q

Which of the following cannot travel in a vacuum: a) a light wave; b) a sound wave; c) a radio wave; d) All can travel in a vacuum; e) None can travel in a vacuum.

A

b) a sound wave.

18
Q

The Earth’s atmosphere is transparent to most waves in the: a) infrared part of the spectrum; b) visible part of the spectrum; c) ultraviolet part of the spectrum; d) entire electromagnetic spectrum.

A

b) visible part of the spectrum.

19
Q

The speed of light in the void between molecules in glass is: a) more than its speed in a vacuum; b) the same as its speed in a vacuum; c) less than its speed in a vacuum.

A

b) the same as its speed in a vacuum.

20
Q

While Earth is experiencing a total solar eclipse, an observer on the side of the moon facing the Earth would see: a) Earth disappear from the sky; b) Earth dim and turn reddish; c) nothing unusual; d) a tiny dark spot move across the face of Earth.

A

d) a tiny dark spot move across the face of Earth.

21
Q

The main difference between a radio wave and a light wave is its: a) speed; b) wavelength; c) frequency; d) all of these; e) two of these.

A

e) two of these.

What are the two main differences?

22
Q

When ultraviolet light is incident upon glass, atoms in the glass: a) are forced into vibration; b) resonate; c) pass the light energy along practically undiminished; d) freely absorb and re-emit most of the ultraviolet light.

A

b) resonate.

23
Q

Electromagnetic waves consist of: a) compressions and rarefactions of electromagnetic pulses; b) oscillating electric and magnetic fields; c) particles of light energy; d) high-frequency gravitational waves.

A

b) oscillating electric and magnetic fields.

24
Q

If the sun were to disappear right now, we wouldn’t know about it for 8 minutes because it takes 8 minutes: a) for the sun to disappear; b) to operate receiving equipment in the dark; c) for light to travel from the sun to the Earth; d) none of these .

A

c) for light to travel from the sun to the Earth.

25
Q

Sunburns are produced by

A

ultraviolet light.

26
Q

Vibrations given by light to their atoms and molecules are turned into random

A

kinetic energy—into internal energy.

27
Q

A total shadow is called an _______ and ​
a partial shadow is called a ___________. ​

A

1st blank: umbra
2nd blank: penumbra

When we stand in the sunlight, some of the light is stopped while other rays continue in a straight-line path. ​

28
Q

A __________ appears where some of the light is blocked but where other light fills it in. ​

A

penumbra;

A penumbra also occurs where light from a broad source is only partially blocked.​

29
Q

Speed of light in glass may vary (less), but the _________ transmitted is the same.

A

frequency

30
Q

The brightest light that the human eye can perceive without damage is some ____ ________ times brighter than the dimmest light that can be perceived.​

A

500 million

31
Q

_______ _________ means we don’t perceive the actual differences in brightness.

A

Lateral inhibition

The brightest places in our visual field are prevented from outshining the rest.​