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Waves

1.____________is when two waves that are the same place and cancel each other out.
a. constructive interference
b.destructive interference
c. polarization
d. the Doppler effect.

2.When a police car comes towards you, the sound of the siren will become_________.
a. high pitched
b. lower pitched
c. polarized
d. there is not enough information to tell.

3.When a police car moves away from you, the sound of the siren will become____________________
a. high pitched
b. lower pitched
c. polarized
d. there is not enough information to tell.

4.________is one form of proof that light travels in waves and can result in an interference pattern that looks like this:
a. polarization
b. Doppler effect
c. destructive interference
d. diffraction

5. When a beam of light enters a new medium, you can predict which way it will based on:
a. whether or not it reflects off of the new medium
b. the relative densities of the substances
c. the Doppler effect
d. polarization

6. As you decrease the tension on a string, the pitch it makes:
a. stays the same
b. increases
c. decreases
d. not enough information to tell

7. As you decrease the length of a tube, the pitch it makes:
a. is unchanged
b. increases
c. decreases
d. not enough information to tell

8. You are standing in the ocean near the beach. You measure the waves to see that they have a frequency of one-half(0.5HZ).You estimate that the wavelength of the waves is 4 meters. What is the speed of the waves(in M/s)?
a.4.5
b. 3.5
c. 2
d. 8

9. A beam of light his a flat mirror.
i. Make a drawing to show the angle of incidence,
ii. The angle of reflection,
iii. And the normal.
iv. What is the relationship between the angle of incidence and the angle of reflection?_____

8. The distance from one wave crest to the next wave crest is called the ___________.

9. A beam of light goes from air into a piece of gelatin.
i. Make a drawing to show the angle of incidence, the angle of refraction, and the normal.
ii On your drawing, show which way the beam of light bends.

10.Draw transverse waves on the axes below. Give the waves amplitudes of 1 cm and wavelengths of 6 cm. Label both axes. Also, mark the axes so that a person could measure the amplitude and wavelength from the axis markings. Please draw the diagram below:

11. You play a note on a guitar string. Right away, you switch-on the amplifier. What parts of the second wave change, and what stays the same?

12. Gamma waves from space are harmful, but cell phone waves are not. Explain why this might be.

13. A boxer gets hit in the belly. Describe any waves that come from the punch. Explain what the waves are like. Explain how they travel. Explain anything else you think is interesting or important about these waves. (Use several sentences, at least six-eight sentences.)