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.
Page Directions
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 16 Hz; if you are moving towards the 'clicker' at 27 m/sec what apparent frequency do you hear instead?
17.27 Hz
14.73 Hz
25.48 Hz
6.52 Hz
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Question 2
You are riding a bike away from a street musician at 13.5 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?
457 Hz
430 Hz
450 Hz
423 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 629 Hz, what is the actual frequency of the car horns.
564 Hz
701 Hz
570 Hz
694 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 27 crests every 10 seconds. Shortly afterwards you come to rest on the water and measure the waves to have an actual frequency of 11 every 10 seconds with a wave speed of 11.7 m/sec. How fast was your boat traveling before?
3.4 m/sec
8.0 m/sec
40.4 m/sec
17.0 m/sec
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Question 5
You are speeding away from a loud speaker. If the original frequency of 629 Hz is shifted to 594 Hz, what is your speed away from the speaker?
18.9 m/sec
10 m/sec
32 m/sec
20 m/sec
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Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 314.5 Hz is reflected back at 301 Hz, what is the speed of the projectile?
15.2 m/sec
32.5 m/sec
25.2 m/sec
14.6 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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