Page 223 - 9780077418427.pdf

/Users/user-f465/Desktop
tiL12214_ch07_177-202.indd Page 200 9/1/10 9:44 PM user-f465
tiL12214_ch07_177-202.indd Page 200 9/1/10 9:44 PM user-f465 /Users/user-f465/Desktop

18. The concept that vibrating molecules emit light in discrete 28. A prism separates the colors of sunlight into a spectrum because
amounts of energy, called quanta, was proposed by a. each wavelength of light has its own index of refraction.
a. Newton. b. longer wavelengths are refracted more than shorter
b. Fresnel. wavelengths.
c. Planck. c. red light is refracted the most, violet the least.
d. Maxwell. d. all of the above are correct.
19. The photoelectric effect was explained, using Planck’s work, by 29. Which of the following can only be explained by a wave model of
a. Planck. light?
b. Einstein. a. Reflection
c. Maxwell. b. Refraction
d. Young. c. Interference
20. Today, light is considered to be packets of energy with a d. Photoelectric effect
frequency related to its energy. These packets are called 30. The polarization behavior of light is best explained by
a. gravitons. considering light to be
b. gluons. a. longitudinal waves.
c. photons. b. transverse waves.
d. quarks. c. particles.
21. Fiber optics transmits information using d. particles with ends, or poles.
a. sound. 31. Max Planck made the revolutionary discovery that the energy of
b. computers. vibrating molecules involved in blackbody radiation existed only in
c. light. a. multiples of certain fixed amounts.
d. all of the above. b. amounts that smoothly graded one into the next.
22. A luminous object c. the same, constant amount of energy in all situations.
a. reflects a dim blue-green light in the dark. d. amounts that were never consistent from one experiment to
b. produces light of its own by any method. the next.
c. shines by reflected light only, such as the Moon. 32. Today, light is considered to be
d. glows only in the absence of light. a. tiny particles of matter that move through space, having no
23. An object is hot enough to emit a dull red glow. When this object wave properties.
is heated even more, it will emit b. electromagnetic waves only, with no properties of particles.
a. shorter-wavelength, higher-frequency radiation. c. a small-scale phenomenon without a sharp distinction
b. longer-wavelength, lower-frequency radiation. between particle and wave properties.
c. the same wavelengths as before with more energy. d. something that is completely unknown.
d. more of the same wavelengths. 33. As the temperature of an incandescent object is increased,
24. The difference in the light emitted from a candle, an incandescent a. more infrared radiation is emitted with less UV.
lightbulb, and the Sun is basically due to differences in b. there is a decrease in the frequency of radiation emitted.
a. energy sources. c. the radiation emitted shifts toward infrared.
b. materials. d. more radiation is emitted with a shift to higher frequencies.
c. temperatures. 34. Is it possible to see light without the light interacting with matter?
d. phases of matter. a. Yes.
25. You are able to see in shaded areas, such as under a tree, because b. No.
light has undergone c. Only for opaque objects.
a. refraction. d. Only for transparent objects.
b. incident bending. 35. The electromagnetic wave model defines an electromagnetic
c. a change in speed. wave as having
d. diffuse reflection. a. a velocity.
26. An image that is not produced by light rays coming from the b. a magnetic field.
image but is the result of your brain’s interpretations of light rays c. an electric field.
is called a (an) d. all of the above.
a. real image. 36. Of the following, the electromagnetic wave with the shortest
b. imagined image. wavelength is
c. virtual image. a. radio wave.
d. phony image. b. infrared light.
27. Any part of the electromagnetic spectrum, including the colors c. ultraviolet light.
of visible light, can be measured in units of d. X rays.
a. wavelength. 37. Of the following, the electromagnetic wave with the lowest
b. frequency. energy is
c. energy. a. radio wave.
d. any of the above. b. infrared light.
c. ultraviolet light.
d. X rays.

200 CHAPTER 7 Light 7-24