Practice Problems
Doppler Effect
Topics:
On this worksheet you may assume that the speed of sound in air is 340 m/sec unless otherwise stated.
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The numerical values in this worksheet are randomly generated allowing students the opportunity to conveniently practice, and drill, common situations.
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Question 1
A 'clicker' is sounding at 13 Hz; if you are moving towards the 'clicker' at 28 m/sec what apparent frequency do you hear instead?
11.93 Hz
6.96 Hz
14.07 Hz
19.04 Hz
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Question 2
You are riding a bike away from a street musician at 14 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?
458 Hz
422 Hz
451 Hz
429 Hz
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Question 3
You are in an ambulance driving towards an accident at 35 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 613 Hz, what is the actual frequency of the car horns.
550 Hz
556 Hz
683 Hz
676 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 28 crests every 10 seconds. Shortly afterwards you come to rest on the water and measure the waves to have an actual frequency of 8 every 10 seconds with a wave speed of 11.7 m/sec. How fast was your boat traveling before?
2.6 m/sec
52.7 m/sec
4.7 m/sec
29.3 m/sec
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Question 5
You are speeding away from a loud speaker. If the original frequency of 613 Hz is shifted to 578 Hz, what is your speed away from the speaker?
19.4 m/sec
21 m/sec
10 m/sec
32 m/sec
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Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 306.5 Hz is reflected back at 292.5 Hz, what is the speed of the projectile?
24.3 m/sec
32.4 m/sec
16.3 m/sec
15.5 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
cannot be determined
away from the sonar
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