Chapter 26/27

What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km? more than 1 Hz less than 1 Hz 1 Hz

1 hz

At the same time an astronaut on the moon sees a solar eclipse, observers on Earth see a solar eclipse. no eclipse at all. a lunar eclipse.

a lunar eclipse

If an electric charge is shaken up and down a magnetic field is created. its mass decreases. light is emitted. electron excitation occurs. sound is emitted.

a magnetic field is created

A whitish sky is evidence that the atmosphere contains predominantly small particles. predominantly large particles. pollutants. water vapor. a mixture of particle sizes.

a mixture of particle sizes

Which will warm up quicker in sunlight? a piece of clear glass a piece of colored glass both the same

a piece of colored glass

The solar radiation curve is a dent in the otherwise spherical sun. a plot of light intensity versus distance from the sun. a plot of the colors of sunlight versus their frequencies. a plot of brightness of sunlight versus its frequency. the path taken by the sun as it travels around the Earth.

a plot of brightness of sunlight versus its frequency

Which of the following cannot travel in a vacuum? a sound wave a radio wave a light wave All can travel in a vacuum. None can travel in a vacuum.

a sound waves

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

a tiny dark spot move across the face of the earth

The main difference between the retina of a human eye and that of a dog's eye is the predominance of cones in a dog's retina. absence of cones in a human's eye. absence of cones in a dog's retina. more intricate optic nerve in a human's eye. none of these

absence of cones in a dog's retina

When the frequency of light matches the natural frequency of molecules in a material, light is reflected. absorbed. transmitted. none of these

absorbed

Materials generally become warmer when light is reflected by them. transmitted by them. absorbed by them. all of these none of these

absorbed by them

The greenish blue of water is evidence for the reflection of greenish-blue light. interaction between green and blue frequencies of light. absorption of greenish-blue light. reflection of red light. absorption of red light.

absorption of red light

The source of all electromagnetic waves is changes in atomic energy levels. crystalline fluctuations. accelerating electric charges. vibrating atoms. none of these

acceleration electric charges

Colors seen on TV results from color addition. subtraction. either of these neither of these

addition

If three primary colors of light are to shine on a white wall to produce a white spot, the primaries must be subtractive. divisive. multiplicative. additive.

additive

Glass is transparent to wave frequencies that are below its natural frequencies. match its natural frequencies. both of these none of these

are below its natural frequencies

When visible light is incident upon clear glass, atoms in the glass resonate. convert the light energy into internal energy. are forced into vibration.

are forced into vibration

Distant dark colored hills appear blue because that is the color of the selectively reflected light that reaches a distant observer. sky that is reflected off the hills. reflected light that survives scattering. atmosphere between the observer and the hills.

atmosphere between the observer and the hills

A variety of sunset colors is evidence for a variety of atmospheric temperatures. elements in the sun. primary colors. apparent atmospheric thicknesses. atmospheric particles.

atmospheric particles

A mixture of red and green pigments appears orange. blue. magenta. yellow. blackish brown.

blackish brown

If molecules in the sky scattered orange light instead of blue light, sunsets would be colored orange. blue. yellow. green. none of these

blue

What color light is transmitted by a piece of blue glass? blue red yellow white orange

blue

On a planet where atmospheric gases are yellow, distant snow covered hills would look reddish. greenish. yellowish. bluish. untinted.

bluish

If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to reach Earth would be the light signal. radio signal. both would reach Earth at the same time.

both would reach earth at the same time

The sensation of color is seen when light falls on the eye's rods. cones. both neither

cones

A sheet of red paper will look black when illuminated with yellow light. cyan light. red light. magenta light. none of these

cyan light

The fact that light travels at 300,000 km/s is a consequence of electromagnetic field induction. Maxwell's laws. electromagnetic wave propagation. energy conservation. none of these

energy conservation

If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes for light to travel from the sun to the Earth. for the sun to disappear. to operate receiving equipment in the dark. all of these none of these

for light to travel from the sun to the earth

Different colors of light correspond to different light polarities. velocities. frequencies. intensities. none of these

frequencies

If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a speed of 1000 m/s. period of 1000 s. frequency of 1000 Hz. wavelength of 1000 m. wavelength of 1000 km.

frequency of 1000hz

A mixture of cyan and yellow pigments appears magenta. blue. blackish brown. green. orange.

green

If sunlight were green instead of white, the most comfortable color to wear on a hot day would be violet. blue. magenta. green. yellow.

green

Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in the clear glass. green glass. Neither - it will be the same in each.

green glass

Infrared waves are often called heat waves because they consist of frequencies lower than those of visible light. are the predominant waves emitted by the sun. emanate from relatively hot sources. induce resonance in molecules and increase internal energy in a substance. are absorbed rather than reflected by the skin.

induce resonance in molecules and increase internal energy in a substance

The part of the electromagnetic spectrum most absorbed by water is ultraviolet. infrared. higher frequencies in the visible. lower frequencies in the visible. middle frequencies in the visible.

infrared

Most of the waves in the electromagnetic spectrum are. blue light. invisible. green light. red light.

invisible

Things seen by moonlight usually aren't colored because moonlight photons don't have enough energy to activate the retina's cones. is too dim to activate the retina's cones. doesn't have very many colors in it. all of these none of these

is too dim to activate the retina's cones

Color depends on what characteristic of light? its frequency its amplitude both of these

its frequency

The sky is the deepest blue just before a rainstorm. during a rainstorm. just before sunset. just after a rainstorm. when the air is humid.

just after a rainstorm

Compared to its average speed in air, the average speed of a beam of light in glass is more. the same. less.

less

Compared to ultraviolet waves, the wavelength of infrared waves is longer. shorter. the same.

longer

The sun is more likely to appear red at sunset than in the middle of the day as a result of the longer path of air through which sunlight travels. pollutants emitted by humans in daylight hours. lower frequencies of light emitted late in the day by the sun. absorption effects of the smaller particles in the air. scattering of lower frequencies by larger particles in the air.

longer path of air through which sunlight travels

The moon would be at its fullest just before the time of a solar eclipse. lunar eclipse. both of these none of these

lunar eclipse

If sunlight were green instead of white, the most comfortable color to wear on a cold day would be blue. yellow. violet. green. magenta.

magenta

Look at a full-color picture in a magazine with a magnifying glass and you'll see that the inks used are magenta, cyan, and yellow. red, green, and blue. red, green, blue, and black. magenta, cyan, yellow, and black. none of these

magenta, cyan, yellow, and black

Glass is opaque to wave frequencies that match its natural frequencies. are below its natural frequencies. both of these none of these

match its natural frequencies

The main difference between a radio wave and a sound wave is their different modes of travel. amplitudes. frequencies. wavelengths. energies.

modes of travel

A lunar eclipse occurs when the moon passes into Earth's shadow. Earth passes into the sun's shadow. Earth passes into the moon's shadow. sun passes into Earth's shadow.

moon passes into earth's shadow

What is the wavelength of an electromagnetic wave that has a frequency of 3 kilohertz? 1 km more than 1 km less than 1 km

more than 1 km

What is the wavelength of an electromagnetic wave that has a frequency of 1 hertz? 1 m less than 1 m more than 1 m

more than 1 m

The cones in the retina of the eye are uniformly spread along the visual field. most densely packed at the center of vision. concentrated along the periphery of vision.

most densely pack at the center of vision

A red crab very deep in water, where sunlight is dim, appears no color - black. cyan. red. brown. orange.

no color - black

The atmosphere of Jupiter is more than 1000 km thick. From the planet's surface, the noon-day sun would appear faintly white. white. not at all. none of these

none of these

Electromagnetic waves consist of particles of light energy. oscillating electric and magnetic fields. compressions and rarefactions of electromagnetic pulses. high-frequency gravitational waves.

oscillating electric and magnetic fields.

The whiteness of clouds is evidence in the clouds for a variety of "seeds" upon which condensation of cloud material forms. water prisms. light intensities. particle sizes. molecules.

particle sizes

A partial solar eclipse occurs for people in the sun's umbra. penumbra. none of these

penumbra

Complementary colors are two colors that produce white light when added together. look good together. are additive primary colors. are subtractive primary colors. are right for each other.

produce white light when added together

Magenta light is really a mixture of red and cyan light. red and yellow light. yellow and green light. red and blue light. none of these

red and blue light

The colored dots that make up the color on a TV screen are yellow, blue, green. red, green, yellow. red, blue, yellow. red, blue, green. magenta, cyan, yellow.

red, blue, green

If the atmosphere were about 40 times thicker, at noon the sun would appear blue-violet. red-orange. orange-green. green-blue. none of these

red-orange

On a planet where atmospheric gases are red, distant dark colored hills would look untinted. bluish. yellowish. reddish. greenish.

reddish

The color of an opaque object is the same as the light that is absorbed. reflected. transmitted. all of these none of these

reflected

Distant snow covered hills appear yellowish because that is the color of the sky that is reflected off the hills. reflected light that survives scattering. selectively reflected light that reaches a distant observer. atmosphere between the observer and the hills.

reflected light that survives scattering

The redness of the lunar eclipse is evidence for the infrared light continually emitted by the moon. faintly radiating atoms in our own atmosphere when sunlight is not incident upon them. scattering of lower frequencies of light by the moon. dim light that is incident upon the moon by Jupiter and other planets. refraction of sunsets and sunrises all around the world.

refraction of sunsets and sunrises all around the world

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

resonate

The sky is blue because air molecules in the sky act as tiny sources of white light. prisms. resonators which scatter blue light. mirrors which reflect only blue light. none of these

resonators which scatter blue light

Sunsets are red, blue jays are blue; the reason's the same: scattered sunlight - nothing new. no one knows, but it is true. pigments that reflect in the blue. aerosols and all such goo.

scattered sunlight - nothing new

In the periphery of our vision, we are insensitive to color and movement. sensitive to both movement and color. sensitive to movement, but cannot see color. more sensitive to low frequencies than high ones. none of these

sensitive to movement, but cannot see color

Which interacts more with sounds of relatively high frequencies? large bells small bells both the same

small bells

Which interacts more with light of relatively high frequencies? large particles small particles both the same

small particles

Which of the following is fundamentally different from the others? X-rays light waves gamma rays radio waves sound waves

sound waves

Colors seen on the cover of our physics book result from color addition. subtraction. either of these neither of these

subtraction

A pair of sunglasses and a pair of clear reading glasses are left in the sunlight. The hotter glasses would be the sunglasses. reading glasses. both neither

sunglasses

Red sunsets are due to lower frequencies of light that survive being scattered in the air. are reflected by clouds and relatively large particles in the air. appear reddish orange to the eye. are refracted from larger particles in the air. are scattered from larger particles in the air.

survive being scattered in the air

Information-carrying nerves are connected to the retina at the periphery. the fovea. the blind spot. the iris. the cornea.

the blind spot

A solar eclipse occurs when the the moon's shadow touches Earth. moon passes into the Earth's shadow. sun passes into Earth's shadow.

the moon's shadow touches earth

Compared to radio waves, the velocity of visible light waves in a vacuum is less. the same. more.

the same

Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is considerably less. slightly less. slightly more. considerably more. the same.

the same

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

the same as its speed in a vacuum

Red-hot and blue-hot stars appear white to the eye because the eye has difficulty seeing color at night. they are overwhelmed by the blackness of the nighttime sky. they are too dim to fire the rods. eye receptivity peaks in the yellow-green part of the spectrum. they are too dim to fire the cones.

they are too dim to fire the cones

How many colors of ink are used to print full-color pictures? three plus black six plus black two plus black one plus black four plus black

three plus black

The main difference between a radio wave and a light wave is its wavelength. speed. frequency. all of these two of these

two of these

The size of the pupil of your eye depends on the brightness of light in the room. your mood. the temperature of the room. the time of day. two of these

two of these

Sunburns are produced by visible light. ultraviolet light. infrared light. all of these none of these

ultraviolet light

The natural frequency of the atoms in glass is in the infrared part of the spectrum. ultraviolet part of the spectrum. visible part of the spectrum.

ultraviolet part of the spectrum

The Earth's atmosphere is transparent to most waves in the ultraviolet part of the spectrum. entire electromagnetic spectrum. visible part of the spectrum. infrared part of the spectrum.

visible part of the spectrum

Which of these electromagnetic waves has the shortest wavelength? X-rays infrared waves ultraviolet waves radio waves light waves

x-rays

The complementary color of blue is green. red. magenta. cyan. yellow.

yellow

A blue object will appear black when illuminated with blue light. magenta light. cyan light. yellow light. none of these

yellow light

The brightest color emitted by the sun is green-blue. red. violet. orange. yellow-green.

yellow-green