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Physical Science, 5/e
Bill Tillery, Arizona State University

Light

Chapter 8 Multiple Choice Quiz 2

Please answer all questions



1

A luminous object is an object that
A)gives off a dim blue-green light in the dark.
B)produces light of its own by any method.
C)shines by reflected light only, such as the moon.
D)an object that glows only in the absence of light.
2

According to the electromagnetic wave model, visible light is produced when
A)an electric charge is accelerated with a magnitude within a given range.
B)an electric charge is moved at a constant velocity.
C)a blackbody is heated to any temperature above absolute zero.
D)an object absorbs electromagnetic radiation.
3

An object is hot enough to emit a dull red glow. When this object is heated even more, it will
A)emit shorter-wavelength, higher-frequency radiation.
B)emit longer-wavelength, lower-frequency radiation.
C)emit the same wavelengths as before, but with more energy.
D)emit more of the same wavelengths with more energy.
4

The difference in the light emitted from a candle, an incandescent lightbulb, and the sun is basically from differences in
A)energy sources.
B)materials.
C)temperatures.
D)phases of matter.
5

Before it travels through the earth's atmosphere, sunlight is mostly
A)infrared radiation.
B)visible light.
C)ultraviolet radiation.
D)blue light.
6

You are able to see in shaded areas, such as under a tree, because light has undergone
A)refraction.
B)incident bending.
C)a change in speed.
D)diffuse reflection.
7

An image that is not produced by light rays coming from the image, but is the result of your brain's interpretations of light rays is called a(n)
A)real image.
B)imagined image.
C)virtual image.
D)phony image.
8

Light traveling at some angle as it moves from water into the air is refracted away from the normal as it enters the air, so the fish you see under water is actually (draw a sketch if needed)
A)above the refracted image.
B)below the refracted image.
C)beside the refracted image.
D)in the same place as the refracted image.
9

When viewed straight down (90° to the surface), a fish under water is
A)above the image (away from you).
B)below the image (closer to you).
C)beside the image.
D)in the same place as the image.
10

The ratio of the speed of light in a vacuum to the speed of light in some transparent materials is called
A)the critical angle.
B)total internal reflection.
C)the law of reflection.
D)the index of refraction.
11

Any part of the electromagnetic spectrum, including the colors of visible light, can be measured in units of
A)wavelength.
B)frequency.
C)energy.
D)any of the above.
12

A prism separates the colors of sunlight into a spectrum because
A)each wavelength of light has its own index of refraction.
B)longer wavelengths are refracted more than shorter wavelengths.
C)red light is refracted the most, violet the least.
D)all of the above.
13

Light moving through a small pinhole does not make a shadow with a distinct, sharp edge because of
A)refraction.
B)diffraction.
C)polarization.
D)interference.
14

Which of the following can only be explained by a wave model of light?
A)reflection
B)refraction
C)interference
D)photoelectric effect
15

The polarization behavior of light is best explained by considering light to be
A)longitudinal waves.
B)transverse waves.
C)particles.
D)particles with ends, or poles.
16

The sky appears to be blue when the sun is high in the sky because
A)blue is the color of air, water, and other fluids in large amounts.
B)red light is scattered more than blue.
C)blue light is scattered more than the other colors.
D)none of the above.
17

The photoelectric effect proved to be a problem for a wave model of light because
A)the number of electrons ejected varied directly with the intensity of the light.
B)the light intensity had no effect on the energy of the ejected electrons.
C)the energy of the ejected electrons varied inversely with the intensity of the light.
D)the energy of the ejected electrons varied directly with the intensity of the light.
18

Max Planck made the revolutionary discovery that the energy of vibrating molecules involved in blackbody radiation existed only in
A)multiples of certain fixed amounts.
B)amounts that smoothly graded one into the next.
C)the same, constant amount of energy in all situations.
D)amounts that were never consistent from one experiment to the next.
19

Einstein applied Planck's quantum discovery to light and found
A)a direct relationship between the energy and frequency of light.
B)that the energy of a photon divided by the frequency of the photon always equaled a constant known as Planck's constant.
C)that the energy of a photon divided by Planck's constant always equaled the frequency.
D)all of the above.
20

Today, light is considered to be
A)tiny particles of matter that move through space, having no wave properties.
B)electromagnetic waves only, with no properties of particles.
C)a small-scale phenomenon without a sharp distinction between particle and wave properties.
D)something that is completely unknown.