Quiz 11: Light
Physics & Astronomy
Q 1Q 1
If an electric charge is rapidly shaken up and down,
A)sound is emitted.
B)light is emitted.
C)electron excitation occurs.
D)an electromagnetic wave is produced.
Free
Multiple Choice
D
Q 2Q 2
Most of the waves in the electromagnetic spectrum are
A)red light.
B)blue light.
C)green light.
D)invisible.
Free
Multiple Choice
D
Q 3Q 3
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 sound waves.
Free
Multiple Choice
B
Q 4Q 4
The source of electromagnetic waves is vibrating
A)electric charges.
B)atoms.
C)molecules.
D)energy fields.
Free
Multiple Choice
Q 5Q 5
A changing electric field induces a changing
A)magnetic field.
B)electromagnetic field.
C)both of these
D)neither of these
Free
Multiple Choice
Q 6Q 6
The frequency of an electromagnetic wave and the frequency of the vibrating electrons that produce it are
A)nearly the same.
B)the same.
C)quite different.
Free
Multiple Choice
Q 7Q 7
Which of the following occupies the smallest percentage of the electromagnetic spectrum?
A)radio waves
B)microwaves
C)visible light
D)gamma rays
Free
Multiple Choice
Q 8Q 8
Which of these has a higher frequency than visible light?
A)radio wave
B)microwave
C)infrared wave
D)ultraviolet wave
E)all do
Free
Multiple Choice
Q 9Q 9
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
Free
Multiple Choice
Q 10Q 10
Electromagnetic waves consist of
A)compressions and rarefactions of electromagnetic pulses.
B)vibrating electric and magnetic fields.
C)particles of light energy.
D)high-frequency sound waves.
Free
Multiple Choice
Q 11Q 11
Electromagnetic waves can travel in
A)a vacuum.
B)water.
C)both of these
D)none of the above
Free
Multiple Choice
Free
Multiple Choice
Q 13Q 13
Which have the longest wavelengths when traveling in a vacuum?
A)radio waves
B)light
C)X-rays
D)all the same
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Multiple Choice
Free
Multiple Choice
Q 15Q 15
The main difference between a radio wave and a sound wave is
A)frequency.
B)wavelength.
C)energy.
D)amplitude.
E)basic nature.
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Multiple Choice
Q 16Q 16
A sound wave and a light wave have identical
A)speeds.
B)wavelengths.
C)frequencies.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 17Q 17
Both a radio wave and light wave have identical
A)speeds.
B)wavelengths.
C)frequencies.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 18Q 18
A wave with a high frequency has a relatively
A)short wavelength.
B)long wavelength.
C)both of these
D)none of the above
Free
Multiple Choice
Q 19Q 19
A wave with a long wavelength has a relatively
A)low frequency.
B)high frequency.
C)both of these
D)neither
Free
Multiple Choice
Q 20Q 20
Relative to radio waves,the velocity of visible light waves in a vacuum is
A)less.
B)more.
C)the same.
Free
Multiple Choice
Q 21Q 21
Relative to ultraviolet waves,the wavelength of infrared waves is
A)shorter.
B)longer.
C)the same.
Free
Multiple Choice
Q 22Q 22
Your friend says that any radio wave travels appreciably faster than any sound wave.
A)agree with your friend unconditionally
B)agree with your friend for most common cases
C)disagree with your friend
D)find a new friend
Free
Multiple Choice
Q 23Q 23
Radio waves travel
A)always much faster than sound waves.
B)usually at the same speed as sound waves.
C)slower,on average,than sound waves.
D)at a speed that depends on frequency.
Free
Multiple Choice
Q 24Q 24
An electron vibrating to and fro 1000 times per second generates an electromagnetic wave having a
A)period of 1000 s.
B)speed of 1000 m/s.
C)wavelength of 1000 m.
D)frequency of 1000 Hz.
Free
Multiple Choice
Q 25Q 25
If a light signal and a radio signal were emitted simultaneously from Alpha Centauri,the first to reach Earth would be the
A)radio signal.
B)light signal.
C)both the same time
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Multiple Choice
Q 26Q 26
If a light signal and a radio signal were emitted simultaneously from the Moon,the first signal to reach Earth would be
A)radio.
B)light.
C)both of these
D)none of the above
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Multiple Choice
Q 27Q 27
The distance between Earth and the Moon is 3.84 108 m.A pulse of laser light aimed at the Moon that bounces back to Earth undergoes a round-trip time of about
A)zero seconds.
B)less than 1 second.
C)two and a half seconds.
D)three seconds.
Free
Multiple Choice
Q 28Q 28
Relative to its average speed in air,the average speed of a beam of light in glass is
A)more.
B)the same.
C)less.
Free
Multiple Choice
Q 29Q 29
Electrons in glass have a natural frequency in the
A)infrared region of the spectrum.
B)visible region of the spectrum.
C)ultraviolet region of the spectrum.
Free
Multiple Choice
Q 30Q 30
When ultraviolet light is incident upon glass,most atoms in the glass
A)resonate.
B)pass the light energy along practically undiminished.
C)freely absorb and reemit most of the ultraviolet light.
Free
Multiple Choice
Q 31Q 31
Visible light that shines on a pane of transparent glass
A)is mostly reflected.
B)produces a chain of absorptions and re-emissions through the glass.
C)mostly transforms to thermal energy.
Free
Multiple Choice
Q 32Q 32
When visible light is incident upon transparent glass,most atoms in the glass
A)are forced into vibration.
B)resonate.
C)convert the light energy into thermal energy.
Free
Multiple Choice
Q 33Q 33
Non-reflected ultraviolet light that shines on a pane of transparent glass
A)produces a chain of absorptions and re-emissions through the glass.
B)transforms to thermal energy.
C)is mostly reflected.
Free
Multiple Choice
Q 34Q 34
Consider light energy that is momentarily absorbed in glass and then reemitted.Relative to the absorbed light,the frequency of the reemitted light is
A)less.
B)the same.
C)more.
Free
Multiple Choice
Q 35Q 35
Compared with the speed of light in a vacuum,the speed of light in the empty space between molecules in glass is
A)more.
B)the same.
C)less.
Free
Multiple Choice
Q 36Q 36
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 of molecules in the skin that becomes thermal energy.
D)are absorbed rather than reflected by the skin.
E)are the predominant waves emitted by the Sun.
Free
Multiple Choice
Q 37Q 37
Compared with the photons of light that shines on glass,the emerging photons are
A)the same photons.
B)different though identical.
C)a mixture of being the same and different.
Free
Multiple Choice
Q 38Q 38
Metals are shiny because
A)they reflect 100% of incident light.
B)they are poor absorbers of light.
C)loose electrons vibrate to the oscillations of any incident light.
D)none of the above
Free
Multiple Choice
Q 39Q 39
Materials generally become warmer when light is
A)absorbed by them.
B)reflected by them.
C)transmitted by them.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 40Q 40
Glass is transparent to light of frequencies that
A)match its natural frequencies.
B)are below its natural frequencies.
C)both of these
D)none of the above
Free
Multiple Choice
Q 41Q 41
Glass is opaque to light with wave frequencies that
A)match its natural frequencies.
B)are below its natural frequencies.
C)both of these
D)none of the above
Free
Multiple Choice
Q 42Q 42
Which becomes warmer in sunlight,sunglasses or clear reading glasses?
A)sunglasses.
B)reading glasses.
C)both of these
D)none of the above
Free
Multiple Choice
Q 43Q 43
Which will warm up quicker in sunlight?
A)a piece of colored glass
B)a piece of clear glass
C)both the same
Free
Multiple Choice
Q 44Q 44
Light shines on a pane of green glass and a pane of clear glass.The temperature will be higher in the
A)clear glass.
B)green glass.
C)neither
Free
Multiple Choice
Q 45Q 45
The reason that a surface appears darker when wet has to do with
A)the darkness of liquids.
B)conversion of light to lower frequencies.
C)absorption of multiply-reflecting light inside the wet region.
Free
Multiple Choice
Q 46Q 46
The image seen in a plane mirror is due to
A)specular reflection.
B)diffuse reflection.
C)both of these
D)neither of these
Free
Multiple Choice
Q 47Q 47
When you read from a printed page,you're seeing reflected light that is
A)specular.
B)diffuse.
C)both of these
D)neither of these
Free
Multiple Choice
Q 48Q 48
According to the law of reflection,the incident ray,reflected ray,and normal between them
A)lie in the same plane.
B)may or may not lie in the same plane.
C)lie in planes that are perpendicular to one another.
Free
Multiple Choice
Q 49Q 49
Object and image for a plane mirror lie
A)along the same plane.
B)equal distances from the mirror.
C)at right angles to each other.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 50Q 50
The amount of light reflected from the front surface of common window glass is about
A)4%.
B)8%.
C)40%.
D)92%.
E)96%.
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Multiple Choice
Q 51Q 51
When light reflects from a polished surface,there is a change in its
A)frequency.
B)wavelength.
C)speed.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 52Q 52
The inversion of Marjorie's image in a plane mirror is actually an inversion of
A)left and right.
B)up and down.
C)front and back.
D)all of the above
Free
Multiple Choice
Q 53Q 53
For a curved mirror,the law of reflection holds for
A)the mirror as with a plane mirror.
B)tiny segments that act as plane surfaces.
C)both convex and concave mirrors.
D)only convex mirrors.
Free
Multiple Choice
Q 54Q 54
If you walk toward a mirror at a certain speed,the relative speed between you and your image is
A)half your speed.
B)your speed.
C)twice your speed.
D)none of the above
Free
Multiple Choice
Q 55Q 55
Diffuse reflection occurs when the size of surface irregularities is
A)small compared to the wavelength of the light used.
B)large compared to the wavelength of the light used.
C)either
Free
Multiple Choice
Q 56Q 56
Compared to the wavelength of incident light,diffuse reflection occurs when the size of surface irregularities is
A)smaller.
B)larger.
C)about the same.
Free
Multiple Choice
Q 57Q 57
A rough surface for infrared waves may be polished for
A)radio waves.
B)light waves.
C)both of these
D)neither
Free
Multiple Choice
Q 58Q 58
The shortest plane mirror in which you can see your entire image is
A)half your height.
B)3/4 your height.
C)1/3 your height.
D)equal to your height.
E)dependent on your distance from the mirror.
Free
Multiple Choice
Q 59Q 59
To see his full height,Blinky Bill who is 1.0 meter tall needs a mirror that is at least
A)0.33 m tall.
B)0.50 m tall.
C)0.75 m tall.
D)1 m tall.
E)depends on distance from the mirror.
Free
Multiple Choice
Q 60Q 60
In looking at yourself in a steamy mirror you wipe just enough moisture away to barely see a full view of your face.If you move back from the mirror you'll see
A)a bit more of your face.
B)a bit less of your face.
C)the same amount of your face.
Free
Multiple Choice
Q 61Q 61
When you look at yourself in a pocket mirror,and then hold the mirror farther away,you see
A)more of yourself.
B)less of yourself.
C)the same amount of yourself.
Free
Multiple Choice
Q 62Q 62
A diver shines light up to the surface of a smooth pond at a 10° angle to the normal.Some light passes into the air above,and the part that reflects back into the water makes an angle to the normal of
A)less than 10°.
B)10°.
C)more than 10°.
Free
Multiple Choice
Q 63Q 63
Standing at the shore of a still lake,the reflected view of scenery on the far side of the lake is the view you would see if you were upside down with your eye in the line of sight
A)where it presently is.
B)at the surface of the water where the light reflects.
C)directly beneath you,as far below water level as you are above.
D)close to the distant shore.
E)none of the above
Free
Multiple Choice
Q 64Q 64
When a mirror with a fixed beam on it is rotated through a certain angle,the reflected beam is rotated through an angle
A)equal to the angle of rotation.
B)twice as much.
C)four times as much.
D)none of the above
Free
Multiple Choice
Q 65Q 65
The Moon's reflected image in a lake often appears as a vertical column when the water is
A)perfectly still.
B)slightly rough.
C)very rough,churning with waves.
Free
Multiple Choice
Q 66Q 66
Ninety-five percent of light incident on a mirror is reflected.How much light is reflected from three mirrors in succession?
A)81%
B)86%
C)90%
D)95%
Free
Multiple Choice
Q 67Q 67
Refraction occurs when light passing from one medium to another
A)changes frequency.
B)changes speed.
C)loses energy.
D)reflects inward.
Free
Multiple Choice
Q 68Q 68
Refraction results from changes in light's
A)frequency.
B)incident angles.
C)speed.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 69Q 69
Light changes direction when traveling from air into glass due to changes in light's
A)intensity.
B)wavelength.
C)frequency.
D)velocity.
E)amplitude.
Free
Multiple Choice
Q 70Q 70
A beam of light emerges from water into air at an angle bent
A)towards the normal
B)away from the normal.
C)in a direction parallel to the normal.
D)in a direction perpendicular to the normal.
E)not at all.
Free
Multiple Choice
Q 71Q 71
When a light beam emerges from water into air,the average light speed
A)increases.
B)decreases.
C)remains the same.
Free
Multiple Choice
Q 72Q 72
Refraction causes the bottom of a swimming pool to appear
A)deeper.
B)more shallow.
C)neither
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Multiple Choice
Q 73Q 73
Because of refraction,a person standing waist deep in a swimming pool appears to have
A)shorter legs.
B)longer legs.
C)thinner legs.
D)none of the above
Free
Multiple Choice
Q 74Q 74
Because of refraction a fish in the water appears
A)nearer the surface.
B)deeper in the water.
C)at its actual depth.
Free
Multiple Choice
Q 75Q 75
If you wish to spear a fish with a regular spear,you should compensate for refraction and throw your spear
A)directly at the sighted fish.
B)above the sighted fish.
C)below the sighted fish.
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Multiple Choice
Q 76Q 76
If you wish to spear a red fish with a red laser beam,you should compensate for refraction and aim your laser
A)directly at the sighted fish.
B)above the sighted fish.
C)below the sighted fish.
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Multiple Choice
Q 77Q 77
If you wish to spear a small blue fish with a red laser beam,you should compensate for refraction and aim your laser
A)directly at the sighted fish.
B)above the sighted fish.
C)below the sighted fish.
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Multiple Choice
Q 78Q 78
If you wish to send a beam of laser light from Earth to a space station above the atmosphere near the horizon,aim your laser
A)above your line of sight.
B)below your line of sight.
C)along your line of sight.
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Multiple Choice
Q 79Q 79
When light is refracted,there is a change in its
A)frequency.
B)wavelength.
C)both of these
D)neither
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Multiple Choice
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Q 82Q 82
A mirage is a result of atmospheric
A)reflection.
B)refraction.
C)scattering.
D)dispersion.
E)aberrations.
Free
Multiple Choice
Q 83Q 83
Because of refraction,the Sun near sunset appears
A)higher in the sky.
B)lower in the sky.
C)farther away.
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Multiple Choice
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Multiple Choice
Q 85Q 85
Sometimes on a hot day a distant dry street appears wet,which is due to
A)water from a previous rainfall.
B)reflection of the sky from the street.
C)refracted sky light.
Free
Multiple Choice
Q 86Q 86
A distant palm tree on a hot dry day that often appears to be reflected from water is
A)due to light refracted upward as it grazes the hot surface.
B)the inverse of a mirage.
C)evidence that light travels in straight lines.
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Multiple Choice
Q 87Q 87
The twinkling of stars is a result of atmospheric
A)reflection.
B)refraction.
C)scattering.
D)dispersion.
E)aberrations.
Free
Multiple Choice
Q 88Q 88
The color of an object depends on the colors of
A)the light that illuminates them.
B)molecules that comprise them.
C)the foreground.
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Multiple Choice
Q 89Q 89
The white light from the Sun is a
A)compliment of the surrounding blue sky.
B)composite of light of all the visible frequencies.
C)mixture of selected frequencies of light.
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Multiple Choice
Q 90Q 90
The black fur of a black-and-white bunny is due to light
A)absorption.
B)reflection.
C)refraction.
D)scattering.
Free
Multiple Choice
Q 91Q 91
A pane of red glass transmits primarily
A)red light.
B)the complementary color of red light.
C)all colors of light.
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Multiple Choice
Q 92Q 92
The different colors of the spectrum
A)are sharply divided.
B)blend from one to another.
C)differ from the colors of a rainbow.
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Multiple Choice
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Multiple Choice
Q 94Q 94
The color to which human eyes are most sensitive is
A)red.
B)yellow-green.
C)blue.
D)all the same
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Multiple Choice
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Multiple Choice
Q 96Q 96
Different colors of light correspond to different light
A)velocities.
B)intensities.
C)polarities.
D)frequencies.
E)none of the above
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Multiple Choice
Q 97Q 97
The color of an opaque object is the same as the light that is
A)transmitted.
B)absorbed.
C)reflected.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 98Q 98
The solar radiation curve is a graph of
A)colors of sunlight versus their frequencies.
B)colors of sunlight versus their wavelengths.
C)the path of the Sun about Earth.
D)brightness versus frequency.
E)intensity versus distance from the Sun.
Free
Multiple Choice
Q 99Q 99
The three colors that comprise the image on a TV screen are
A)red,blue,and yellow.
B)red,blue,and green.
C)yellow,blue,and green.
D)magenta,cyan,and yellow.
E)red,green,and yellow.
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Multiple Choice
Q 100Q 100
Colors seen on TV result from color
A)addition.
B)subtraction.
C)either of these
D)none of the above
Free
Multiple Choice
Q 101Q 101
Colors seen on the cover of our paper-bound physical science text book result from color
A)addition.
B)subtraction.
C)either
D)neither
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Multiple Choice
Q 102Q 102
A golf ball illuminate by only red light casts a colorless shadow.If instead it is also illuminated by a close-by green light source,the non-overlapping shadows will be
A)green and red.
B)cyan and magenta.
C)white.
D)none of the above
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Multiple Choice
Q 103Q 103
Complementary colors are two colors that
A)share the same color scheme.
B)are additive primary colors.
C)are subtractive primary colors.
D)produce white light when combined.
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Multiple Choice
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Multiple Choice
Q 105Q 105
Magenta light is a mixture of
A)red and blue light.
B)red and cyan light.
C)red and yellow light.
D)yellow and green light.
E)none of the above
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Multiple Choice
Q 106Q 106
A mixture of cyan and yellow inks on a printed page appears
A)orange.
B)yellow.
C)magenta.
D)blue.
E)green.
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Multiple Choice
Q 107Q 107
The inks used in printing the full-color photos in a common magazine are
A)red,green,and blue.
B)red,green,blue,and black.
C)magenta,cyan,and yellow.
D)magenta,cyan,yellow,and black.
E)none of the above
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Multiple Choice
Q 108Q 108
Humans see best in the yellow-green region of the spectrum.So the efficiency of sodium yellow-green lamps that illuminate highways is
A)higher.
B)lower.
C)not affected.
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Multiple Choice
Q 109Q 109
Which interacts more with sounds of relatively high frequencies?
A)large bells
B)small bells
C)both the same
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Multiple Choice
Q 110Q 110
Which interacts more with light of relatively high frequencies?
A)large particles
B)small particles
C)both the same
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Multiple Choice
Q 111Q 111
The sky is blue because air molecules in the sky act as tiny
A)mirrors that reflect only blue light.
B)resonators that scatter blue light.
C)sources of white light.
D)prisms.
E)none of the above
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Multiple Choice
Q 112Q 112
A whitish sky is evidence that the atmosphere contains
A)predominantly small particles.
B)predominantly large particles.
C)a mixture of particle sizes.
D)pollutants.
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Multiple Choice
Q 113Q 113
The sky is the deepest blue
A)just before a rainstorm.
B)during a rainstorm.
C)just after a rainstorm.
D)when the air is humid.
E)just before sunset.
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Multiple Choice
Q 114Q 114
Red sunsets are due to light of lower frequencies that
A)is scattered from larger particles in the air.
B)is refracted from larger particles in the air.
C)is reflected by clouds and relatively large particles in the air.
D)survive being scattered in the air.
E)appear reddish orange to the eye.
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Multiple Choice
Q 115Q 115
An important feature of red sunsets is the
A)scattering of lower frequencies by larger particles in the air.
B)longer path of air through which sunlight travels.
C)lower frequencies of light emitted late in the day by the Sun.
D)absorption effects of the smaller particles in the air.
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Multiple Choice
Q 116Q 116
The whiteness of clouds is due mainly to
A)scattering.
B)reflection.
C)polarization.
D)water prisms.
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Multiple Choice
Q 117Q 117
The greenish blue of water is evidence for the
A)reflection of greenish-blue light.
B)reflection of red light.
C)absorption of greenish-blue light.
D)absorption of red light.
E)interaction between green and blue frequencies of light.
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Multiple Choice
Q 118Q 118
The part of the electromagnetic spectrum most absorbed by water is
A)infrared.
B)lower frequencies of visible light.
C)middle frequencies of visible light.
D)higher frequencies of visible light.
E)all of the above
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Multiple Choice
Q 119Q 119
A red crab crawling very deep in the water where sunlight is very dim appears
A)red.
B)orange.
C)cyan.
D)brown.
E)black.
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Multiple Choice
Q 120Q 120
A sheet of red paper will look black when illuminated with
A)red light.
B)yellow light.
C)magenta light.
D)cyan light.
E)none of the above
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Multiple Choice
Q 121Q 121
A blue object will appear black when illuminated with
A)blue light.
B)cyan light.
C)yellow light.
D)light.
E)none of the above
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Multiple Choice
Q 122Q 122
The yellow clothes of a stage performer appear black when illuminated by light that is
A)red.
B)green.
C)blue.
D)all the above combined
E)none of the above
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Multiple Choice
Q 123Q 123
If sunlight were green instead of white,the most comfortable color to wear on a hot day would be
A)magenta.
B)yellow.
C)green.
D)blue.
E)violet.
Free
Multiple Choice
Q 124Q 124
If sunlight were green instead of white,the most comfortable color to wear on a cold day would be
A)magenta.
B)yellow.
C)green.
D)blue.
E)violet.
Free
Multiple Choice
Q 125Q 125
If molecules in the sky scattered red-orange light strongly instead of blue light,sunsets would be
A)orange.
B)yellow.
C)green.
D)blue.
Free
Multiple Choice
Q 126Q 126
If the atmosphere were about 40 times thicker,at noon the Sun would appear
A)red-orange.
B)orange-green.
C)green-blue.
D)blue-violet.
E)none of the above
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Multiple Choice
Q 127Q 127
Consider the appearance of an American flag submerged deep in water.The white stars and red stripes appear
A)cyan and red.
B)cyan and blue.
C)red and black.
D)cyan and black.
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Multiple Choice
Q 128Q 128
Distant dark-colored hills appear blue due to the color of the
A)atmosphere between the observer and the dark hills.
B)selectively reflected light that reaches a distant observer.
C)reflected light that survives scattering.
D)sky that is reflected off the hills.
Free
Multiple Choice
Q 129Q 129
Distant snow-covered hills appear yellowish due to the color of the
A)atmosphere between the observer and the hills.
B)selectively reflected light that reaches a distant observer.
C)reflected light that survives scattering.
D)sky that is reflected off the hills.
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Multiple Choice
Q 130Q 130
The colors dispersed by a prism are due to different light
A)speeds inside the prism.
B)directions inside the prism.
C)energies inside the prism.
D)none of the above
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Multiple Choice
Q 131Q 131
When white light is dispersed in a prism,the fastest light is
A)red.
B)orange.
C)green.
D)blue.
E)same in all
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Multiple Choice
Q 132Q 132
When light from air passes through a prism,light of all frequencies
A)slow down.
B)remain at speed c.
C)speed up.
D)none of the above
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Multiple Choice
Q 133Q 133
When light from the air enters a raindrop,the light
A)slows down.
B)remains at speed c.
C)speeds up.
D)none of the above
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Multiple Choice
Q 134Q 134
Light from inside a raindrop that exits into the air
A)slows down.
B)remains at speed c.
C)speeds up.
D)none of the above
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Multiple Choice
Q 135Q 135
Rainbows are not usually seen as complete circles because
A)the ground is usually in the way.
B)they are actually elliptical.
C)they have no bottom part.
D)raindrops are not perfectly round.
E)rainbows are arched shaped.
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Multiple Choice
Q 136Q 136
A single raindrop illuminated by sunshine disperses
A)a single color.
B)either low,middle,or high frequency colors in most cases.
C)all the colors just like a small prism does.
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Multiple Choice
Q 137Q 137
The secondary rainbow is dimmer than the primary rainbow because
A)its colors are inverted.
B)it is larger,and its energy spreads across more area.
C)it is farther from the viewer.
D)it simply has much less energy than the primary bow.
E)of a double reflection and refraction in the drops.
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Multiple Choice
Q 138Q 138
A primary rainbow is brighter than a secondary rainbow because
A)sunlight reaching it is more intense.
B)there is one less reflection inside the water drops.
C)larger drops produce primary rainbows.
D)the secondary bow is a dim reflection of the primary rainbow.
E)none of the above
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Multiple Choice
Q 139Q 139
Rainbows exist because light is
A)reflected.
B)refracted.
C)both of these
D)none of the above
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Multiple Choice
Q 140Q 140
Different colors of light travel at different speeds in a transparent medium.In a vacuum,different colors of light travel at
A)different speeds.
B)the same speed.
C)decreased speed.
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Multiple Choice
Q 141Q 141
When white light goes from air into water,the color that refracts the most is
A)red.
B)orange.
C)green.
D)violet.
E)all refract the same amount.
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Multiple Choice
Q 142Q 142
When a pulse of white light is incident on a piece of glass,the first color to emerge is
A)red.
B)orange.
C)green.
D)violet.
E)all the same
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Multiple Choice
Q 143Q 143
The image in a pinhole camera is
A)always inverted.
B)sometimes inverted.
C)always right-side up.
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Multiple Choice
Q 144Q 144
Small openings between leaves in a tree act as pinholes.The round spots of light cast on the ground below are images of
A)the Sun.
B)the openings themselves.
C)both of these
D)neither of these
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Multiple Choice
Q 145Q 145
When the tiny hole in a pinhole camera is made larger,the image is
A)brighter but less clear.
B)clearer.
C)right-side up.
D)none of the above
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Multiple Choice
Q 146Q 146
Poke a pinhole in a piece of card and hold it in sunlight and an image of the Sun is cast on the floor.The Sun-image diameter depends on the height of the pinhole above the floor.Measurements for all heights show the Sun-image diameter is about 1/100 the distance between the pinhole and the floor.This means that
A)about 100 end-to-end Sun images would fit between the pinhole and the floor.
B)distance-wise,the Sun is about 100 Suns away from Earth.
C)both of these
D)none of the above
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Multiple Choice
Q 147Q 147
Polarization is a property of
A)transverse waves.
B)longitudinal waves.
C)both of these
D)none of the above
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Multiple Choice
Q 148Q 148
The direction of vibration for an electron and the plane of polarization of the light it emits
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.
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Multiple Choice
Q 149Q 149
Light will not pass through a pair of Polaroids when their axes are
A)parallel.
B)perpendicular.
C)45° to each other.
D)all of the above
E)none of the above
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Multiple Choice
Q 150Q 150
The glare seen from water in a lake is largely
A)horizontally polarized.
B)vertically polarized.
C)nonpolarized.
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Multiple Choice
Q 151Q 151
Because most reflecting surfaces are horizontal,the polarization axes of ordinary sunglasses are
A)vertical.
B)horizontal.
C)at right angles to each other.
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Multiple Choice
Q 152Q 152
The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half,and through a real Polaroid filter is
A)less than half.
B)more than half.
C)half.
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Multiple Choice
Q 153Q 153
An ideal Polaroid will transmit 50% of nonpolarized incident light.How much light is 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%
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Multiple Choice
Q 154Q 154
Because of absorption,a Polaroid will actually transmit about 40% of incident nonpolarized light.Two Polaroids with their axes aligned will transmit
A)0%.
B)40%.
C)100%.
D)between 0% and 40%.
E)between 40% and 100%.
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Multiple Choice
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Essay
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Essay
Q 157Q 157
If you walk at a constant pace across a room of known length,your walking speed is the room length divided by the time to cross the room.Now suppose you repeat your walk but briefly stop along the way to interact with people sitting along your path.What effect does this have on your average speed across the room? How is this analogous to light passing through glass? In what way is it not analogous?
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Essay
Q 158Q 158
What accounts for the additional few minutes of sunlight we experience daily,before sunrise and after sunset?
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Essay
Q 159Q 159
What are the three primary colors for light addition? What colors appear when light of only two primary colors are shone on a white screen? How would the color purple be produced?
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Essay
Q 160Q 160
On a TV screen,red,green,and blue spots of light produce a full spectrum of colors.What spots are activated to produce yellow? Red? Magenta? White?
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Essay
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Essay
Q 163Q 163
When viewing a seascape,what is a major difference in the effect of wearing polarizing sunglasses versus sunglasses that simply cut down on intensity?
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Essay