1. An electromagnetic wave in a vacuum has a wavelength of 0.032 m. What is its frequency?
(1 point)
f = 3.00 脳 108 m/s
f = 9.38 脳 109 Hz
f = 3.00 脳 109 Hz
f = 9.38 脳 108 m/s
2. Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light is
(1 point)
radiation.
a stream of particles.
a wave.
heat.
3. The waves with the longest wavelengths in the electromagnetic spectrum are
(1 point)
infrared rays.
radio waves.
gamma rays.
X-rays.
4. Cellular telephones utilize
(1 point)
radar waves.
very high frequency waves.
very low frequency waves.
microwaves.
5. A translucent material
(1 point)
scatters some light.
transmits all light.
absorbs all light.
reflects all light.
6. Polarized sunglasses work by
(1 point)
blocking light waves that vibrate in one plane.
gradually refracting light as it passes through the lenses.
bending light as it passes from air into the lenses.
reflecting most of the light that strikes the sunglasses.
7. Blue light and yellow light combine to produce white light because
(1 point)
they absorb each other鈥檚 wavelengths.
blue, yellow, and white are primary colors.
they are complementary colors of light.
they are both primary colors of light.
8. Which of the following is NOT true regarding neon lights?
(1 point)
Light is emitted as electrons move through a gas in a tube.
All neon lights are colored by the color of the tubing.
Neon lights may contain other gases, such as helium or krypton.
Each kind of gas produces its own distinctive color.
9. Which kind of light is used to carry information through optical fibers?
(1 point)
incandescent
fluorescent
sodium-vapor light
laser
Completion
Complete each sentence or statement.
10. The farther away you are from a light source, the ____________________ intense it is.
(1 point)
11. When viewed in red light, an object that reflects all the colors of light will appear ____________________.
(1 point)
12. Electromagnetic waves can travel through a(an) ____________________.
(1 point)
13. White light passing through a prism separates into colors because of the differences in the ____________________ of each color of light.
(1 point)
Short Answer
14. What is the photoelectric effect?
(3 points)
15. Which waves have wavelengths longer than those of visible light? Give an example of how each kind of wave is used.
(3 points)
16. What distinguishes a laser from other common light sources?
(3 points)
Figure 18-3
17. Classifying.
Examine Figure 18-3, which represents a pencil in a glass container of a liquid. Is the liquid transparent, translucent, or opaque to visible light? Explain.
(5 points)
18. Applying Concepts.
Explain why the pencil in the Figure 18-3 appears to be broken.
(5 points) We can't ... figure 18-3 isn't there!
Sorry. Guess you're on your own. (Did you try your text book?) 1B
2B
3B
4C
5A
6A
7A
8D
9D
10 less
11Vacuum
12wavelength
you can do the rest yourself :) This is your final test of the year? I think you are supposed to know the answers to these questions already. | 