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 18 Hz; if you are moving towards the 'clicker' at 19 m/sec what apparent frequency do you hear instead?
0.95 Hz
35.05 Hz
16.99 Hz
19.01 Hz
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Question 2
You are riding a bike away from a street musician at 9.5 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?
428 Hz
433 Hz
452 Hz
447 Hz
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Question 3
You are in an ambulance driving towards an accident at 34 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 496 Hz, what is the actual frequency of the car horns.
551 Hz
446 Hz
546 Hz
451 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 19 crests every 10 seconds. Shortly afterwards you come to rest on the water and measure the waves to have an actual frequency of 13 every 10 seconds with a wave speed of 11.3 m/sec. How fast was your boat traveling before?
5.2 m/sec
24.5 m/sec
27.8 m/sec
4.6 m/sec
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Question 5
You are speeding away from a loud speaker. If the original frequency of 496 Hz is shifted to 462 Hz, what is your speed away from the speaker?
25 m/sec
32 m/sec
23.3 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 248 Hz is reflected back at 238.5 Hz, what is the speed of the projectile?
32.7 m/sec
13.5 m/sec
13.0 m/sec
35.8 m/sec
omit
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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