1. Chapter 18
Review

2. 1.
In 1926, Michelson was able to
measure the speed of light using
A lanterns B stars.
C mirrors D sunlight.

3. 2.
To calculate the frequency of
an electromagnetic wave, you
need to know the speed of the
wave and its
A wavelength. B intensity.
C refraction D amplitude.

4. 3. Because light travels in a straight line and casts a shadow, Isaac
Newton hypothesized that light is
A radiation.
B a stream of particles.
C a wave.
D heat.

5. 4.
Electromagnetic waves vary in
A the speed they travel in a
vacuum.
B wavelength and frequency.
C the way they reflect.
D their direction.

6. 5.
Light acts like
A a wave.
B a particle.
C both a wave and a particle.
D neither a wave nor a particle.

7. 6.
Photons travel outward from a
light source in
A a single straight line.
B increasing intensity.
C a small, dense area.
D all directions.

8. 7.
Infrared rays have a shorter
wavelength than
A ultraviolet rays.
B X-rays.
C radar waves.
D gamma rays.

9. A Far from the source, photons spread through a small area.
8. Which of the following occurs as light travels farther from its source?
A Far from the source, photons spread through a small area.
B The intensity of light increases as photons move away from the source.
C The source gives off less light as photons move away from it.
D Farther from the source, photons spread over a larger area.

10. 9. The waves with the longest wavelengths in the
electromagnetic spectrum are
A infrared rays.
B radio waves.
C gamma rays.
D X-rays.

11. 10.
A translucent material
A scatters some light.
B transmits all light.
C absorbs all light.
D reflects all light.

12. 11.
Cellular telephones utilize
A radar waves.
B very high frequency waves.
C very low frequency waves.
D microwaves.

13. 12. The visible light spectrum ranges between
A radar waves and X-rays.
B television waves and infrared rays.
C infrared rays and ultraviolet rays.
D ultraviolet rays and gamma rays.

14. 13. Which of the following occurs
as a light wave bends when it
passes from one medium into
another?
A constructive interference
B refraction
C destructive interference
D reflection

15. 14. A material that reflects or
absorbs all of the light that
strikes it is
A translucent
B opaque
C black
D white

16. 15. In order of increasing frequency,
the electromagnetic waves are
radio waves, infrared waves,
A microwaves, visible light, X-rays and gamma rays
B visible light, UV rays, X-rays and gamma rays
C gamma rays, X-rays, UV rays and visible light
D gamma rays, X-rays, visible light and UV rays

17. 16.
Objects appear fuzzy through a
material that is
A transparent
B translucent
C opaque
D polarized

18. 17.
Microwaves and radar are
examples of
A infrared waves
B radio waves
C X-rays
D UV rays

19. Answer Key C 7. C 13. B A 8. D 14. B B 9. B 15. B B 10. A 16. B
C 11. D 17. B
D 12. C