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Most of the waves in the electromagnetic spectrum are
A) red light.
B) blue light.
C) green light.
D) invisible.
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d
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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.
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b
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The fact that light travels at 300,000km/s is a consequence of
a) electromagnetic wave propagation
b) electromagnetic field induction
c) Maxwell’s laws
d) energy conservation
e) none of these
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d
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A source of electromagnetic waves is
A) Stationary charged particles .
B) vibrating atoms.
C) accelerating electric charges.
D) crystalline fluctuations.
E) none of these
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c
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Electromagnetic waves can travel
A) through a vacuum.
B) through a medium.
C) through either a medium or a vacuum.
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c
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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
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e
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Which of these electromagnetic waves has the shortest wavelength?
A) radio waves
B) infrared waves
C) X-rays
D) ultraviolet waves
E) light waves
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c
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Compared to ultraviolet waves, the wavelength of infrared waves is
A) shorter.
B) longer.
C) the same.
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b
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Compared to radio waves, the velocity of visible light waves in a vacuum is
A) less.
B) more.
C) the same.
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c
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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.
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b
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When visible light is incident upon clear glass, atoms in the glass
A) are forced into vibration.
B) resonate.
C) convert the light energy into internal energy.
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a
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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
A) considerably less.
B) slightly less.
C) the same.
D) slightly more.
E) considerably more.
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c
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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.
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b
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Compared to its average speed in air, the average speed of a beam of light in glass is
A) more.
B) less.
C) the same.
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b
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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
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a
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Red-hot and blue-hot stars appear white to the eye because
a) the eye has difficulty seeing color at night
b) they are too dim to fire the cones
c) they are too dim to fire the rods
d) they are overwhelmed by the blackness of the nighttime sky
e) eye receptivity peaks in the yellow-green part of the spectrum
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b
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Color is seen by
a) the rods in the eye
b) the cones in the eye
c) both of these
d) neither of these
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b
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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 would reach Earth at the same time.
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c
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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.
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b
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The main difference between the retina of a human eye and that of a dog’s eye is the
a) predominance of cones in a dog’s retina
b) absence of cones in a dog’s retina
c) more intricate optic nerve in a human’s eye
d) absence of cones in a human’s eye
e) none of these
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b
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Things seen by moonlight usually aren’t colored because moonlight
a) doesn’t have very many colors in it
b) is too dim to activate the retina’s cones
c) photons don’t have enough energy to activate the retina’s cones
d) all of these
e) none of these
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b
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The solar radiation curve is
a) a dent in the otherwise spherical sun
b) the path taken by the sun as it travels around the Earth
c) a plot of brightness of sunlight versus its frequency
d) a plot of the colors of sunlight versus their frequencies
e) a plot of light intensity versus distance from the sun
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c
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Which will warm up quicker in sunlight?
A) a piece of colored glass
B) a piece of clear glass
C) both the same
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a
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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–it will be the same in each
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b
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The colored dots that make up the color on a TV screen are
A) magenta, cyan, yellow.
B) red, blue, green.
C) yellow, blue, green.
D) red, green, yellow.
E) red, blue, yellow.
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b
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If three primary colors of light are to shine on a white wall to produce a white spot, the primaries must be
a) additive
b) subtractive
c) multiplicative
d) divisive
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a
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How many colors of ink are used to print full-color pictures?
a) one plus black
b) two plus black
c) three plus black
d) four plus black
e) six plus black
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c
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Different colors of light correspond to different light
a) velocities
b) intensities
c) polarities
d) frequencies
e) none of these
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d
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A mixture of red and green pigments appears
a) orange
b) yellow
c) magenta
d) blue
e) blackish brown
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e
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A mixture of cyan and yellow pigments appears
a) orange
b) green
c) magenta
d) blue
e) blackish brown
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b
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Look at a full-color picture in a magazine with a magnifying glass and you’ll see that the inks used 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 these
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d
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Red sunsets are due to lower frequencies of light that
a) are scattered form larger particles in the air
b) are refracted from larger particles in the air
c) are 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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d
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The sun is more likely to appear red at sunset that in the middle of the day as a result of 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) pollutants emitted by humans in daylight hours
e) absorption effects of the smaller particles in the air
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b
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A variety of sunset colors in evidence for a variety of
a) elements in the sun
b) apparent atmospheric thicknesses
c) atmospheric particles
d) atmospheric temperatures
e) primary colors
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c
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The whiteness of clouds is evidence in the clouds for a variety of
a) particle sizes
b) molecules
c) "seeds" upon which condensation of cloud material forms
d) light intensities
e) water prisms
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a
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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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d
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The type of radio waves that are diffracted the most around small buildings are
a) AM
b) FM
c) both diffract equally
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a
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Diffraction is a result of
a) refraction
b) reflection
c) interference
d) polarization
e) dispersion
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c
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Interference is a property
a) light waves
b) sound waves
c) water waves
d) all of these
e) none these
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d
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Colors seen when gasoline forms a thin film on water are a demonstration of
a) refraction
b) reflection
c) dispersion
d) polarization
e) interference
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e
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Iridescent colors seen in the pearly luster of an abalone shell are due to
a) refraction
b) diffraction
c) dispersion
d) polarization
e) interference
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e
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