Practice Problems
Doppler Effect
Directions:
On this worksheet, you may assume that the speed of sound in air is 340 m/sec unless otherwise stated.
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Question 1
A 'clicker' is sounding at 14 Hz; if you are moving towards the 'clicker' at 20 m/sec what apparent frequency do you hear instead?
14.82 Hz
13.18 Hz
23.80 Hz
4.20 Hz
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Question 2
You are riding a bike away from a street musician at 10 m/sec; when the trumpet player hits an 'A'. You know that the frequency of an 'A' should be 440 Hz, what apparent frequency do you hear instead?
448 Hz
432 Hz
427 Hz
453 Hz
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Question 3
You are in an ambulance driving towards an accident at 33 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 640 Hz, what is the actual frequency of the car horns.
578 Hz
709 Hz
702 Hz
583 Hz
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Question 4
You are riding in a boat into oncoming waves and measure the frequency of the waves to be 20 crests every 10 seconds. Shortly afterwards you come to rest on the water and measure the waves to have an actual frequency of 9 every 10 seconds with a wave speed of 11 m/sec. How fast was your boat traveling before?
3.4 m/sec
9.0 m/sec
35.4 m/sec
13.4 m/sec
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Question 5
You are speeding away from a loud speaker. If the original frequency of 640 Hz is shifted to 607 Hz, what is your speed away from the speaker?
17.5 m/sec
18 m/sec
32 m/sec
10 m/sec
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Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 320 Hz is reflected back at 310 Hz, what is the speed of the projectile?
34.0 m/sec
10.6 m/sec
32.9 m/sec
11.0 m/sec
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Question 7
In what direction was the projectile in
Question 6
moving relative to the sonar device?
towards the sonar
away from the sonar
cannot be determined
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William A. Hilburn
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