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7.4 7. Light is said to travel in straight-line paths, as light rays, until it
energy of
_ ( _ ) (frequency) interacts with matter. A line representing the original ray before
Planck’s

=

photon constant it interacts with matter is called a (an)
E = hf a. incoming light ray.
b. incident ray.
KEY TERMS c. reflected light ray.
d. normal ray.
blackbody radiation (p. 178) 8. The image you see in a mirror is
consistent law principle (p. 196) a. a real image.
b. a virtual image.
constancy of speed (p. 196)
c. not really an image.
general theory of relativity (p. 197)
9. Refraction of light happens when light undergoes
incandescent (p. 178)
a. reflection from a surface.
index of refraction (p. 185)
b. a change of speed between two transparent materials.
interference (p. 189)
c. movement through a critical angle.
light ray model (p. 180)
d. a 90° angle of incidence.
luminous (p. 178)
10. The ratio of the speed of light in a vacuum to the speed of light
photoelectric eff ect (p. 193)
in a transparent material is called the
photon (p. 194) a. index of deflection.
polarized (p. 191) b. index of reflection.
quanta (p. 193) c. index of refraction.
real image (p. 183) d. index of diffusion.
refraction (p. 183) 11. The part of the electromagnetic spectrum that our eyes can
total internal refl ection (p. 184) detect is
unpolarized light (p. 191) a. ultraviolet.
virtual image (p. 183) b. infrared.
c. visible.
APPLYING THE CONCEPTS d. all of the above.
12. The component colors of sunlight were first studied by
1. Which of the following is luminous? a. Joule.
a. Moon b. Galileo.
b. Mars c. Newton.
c. Sun d. Watt.
d. All of the above 13. The color order of longer-wavelength to smaller-wavelength
2. A source of light given off as a result of high temperatures is said to be waves in the visible region is
a. luminous. a. red, orange, yellow, green, blue, violet.
b. blackbody radiation. b. red, violet, blue, yellow, green.
c. incandescent. c. violet, blue, green, yellow, orange, red.
d. electromagnetic radiation. d. violet, red, blue, green, yellow, orange.
3. An idealized material that absorbs and perfectly emits 14. The separation of white light into its component colors is
electromagnetic radiation is a (an) a. reflection.
a. star. b. refraction.
b. blackbody. c. dispersion.
c. electromagnetic wave. d. transmission.
d. photon. 15. Polarization of light is best explained by considering light to be
4. Electromagnetic radiation is given off from matter at any a. vibrating waves in one plane.
temperature. This radiation is called b. moving particles in one plane.
a. luminous. c. none of the above.
b. blackbody radiation. 16. Light in one plane is transmitted and light in all other planes is
c. incandescent. absorbed. This is
d. electromagnetic radiation. a. selective absorption.
5. Light interacts with matter by which process? b. polarized absorption.
a. Absorption c. reflection.
b. Reflection d. scattering.
c. Transmission 17. The photoelectric effect is best explained by considering light to be
d. All of the above a. vibrating waves.
6. Materials that do not allow the transmission of any light are called b. moving particles.
a. transparent. c. none of the above.
b. colored.
c. opaque.
d. blackbody.
7-23 CHAPTER 7 Light 199