Physical Science 1
Name:__________________________________
Exam Three
MULTIPLE CHOICE.
Circle the one alternative that best completes the statement
or answers the question.
Each question is worth five points.
1)
A floating leaf oscillates up and down two complete cycles each second as a water
wave passes by.
What is the wave's frequency?
A)
2 Hz
B)
1 Hz
C)
6 Hz
D)
3 Hz
E)
0.5 Hz
Recall that frequency is defined as cycles per second.
If the leaf bobs two complete
cycles each second, its frequency is 2 Hz.
The answer is A.
2)
A Doppler effect occurs when a source of sound moves
The Doppler effect is when the wavelength shortens as waves from an object moving
toward you reach you.
Similarly, when the object is moving away from you, the
waves get farther apart.
The answer is B.
3)
A skipper on a boat notices wave crests passing the anchor chain every 5 s.
The
skipper estimates the distance between crests is 15 m.
What is the speed of the water
waves?
A)
3 m/s
B)
15 m/s
C)
5 m/s
D)
not enough information given
The period of the waves is 5 seconds, so the frequency is 1/5 = 0.2 Hz.
The
wavelength is 15 m.
The product of wavelength and frequency is the wave speed, so
0.2 x 15 = 3 m/s.
The answer is A.
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 Fall '10
 Jay
 Light, Hertz, Wavelength, physical science

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