Chapter 18

Review

1.

In 1926, Michelson was able to

measure the speed of light using

A lanterns. B stars.

C mirrors. D sunlight.

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.

3.

Because light travels in a straightline and casts a shadow, IsaacNewton hypothesized that light isA radiation. B a stream of particles.C a wave.D heat.

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.

5.

Light acts like

A a wave.

B a particle.

C both a wave and a particle.

D neither a wave nor a particle.

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.

7.

Infrared rays have a shorter

wavelength than

A ultraviolet rays.

B X-rays.

C radar waves.

D gamma rays.

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.

9.

The waves with the longest wavelengths in theelectromagnetic spectrum areA infrared rays.B radio waves.C gamma rays.D X-rays.

10.

A translucent material

A scatters some light.

B transmits all light.

C absorbs all light.

D reflects all light.

11.

Cellular telephones utilize

A radar waves.

B very high frequency waves.

C very low frequency waves.

D microwaves.

12. The visible light spectrum

ranges betweenA radar waves and X-rays.

B television waves and infrared rays.

C infrared rays and ultraviolet rays.

D ultraviolet rays and gamma rays.

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

14. A material that reflects or

absorbs all of the light that

strikes it is

A translucent

B opaque

C black

D white

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

16.

Objects appear fuzzy through a

material that is

A transparent

B translucent

C opaque

D polarized

17.

Microwaves and radar are

examples of

A infrared waves

B radio waves

C X-rays

D UV rays

Answer Key

1. C 7. C 13. B

2. A 8. D 14. B

3. B 9. B 15. B

4. B 10. A 16. B

5. C 11. D 17. B

6. D 12. C