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 12 Hz; if you are moving towards the 'clicker' at 25 m/sec what apparent frequency do you hear instead?
6.24 Hz
11.12 Hz
17.76 Hz
12.88 Hz
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Question 2
You are riding a bike away from a street musician at 12.5 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?
450 Hz
424 Hz
430 Hz
456 Hz
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Question 3
You are in an ambulance driving towards an accident at 31 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 409 Hz, what is the actual frequency of the car horns.
375 Hz
446 Hz
372 Hz
450 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 25 crests every 10 seconds. Shortly afterwards you come to rest on the water and measure the waves to have an actual frequency of 7 every 10 seconds with a wave speed of 10.3 m/sec. How fast was your boat traveling before?
4.0 m/sec
2.3 m/sec
26.5 m/sec
47.1 m/sec
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Question 5
You are speeding away from a loud speaker. If the original frequency of 409 Hz is shifted to 378 Hz, what is your speed away from the speaker?
31 m/sec
28 m/sec
25.8 m/sec
11 m/sec
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Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 204.5 Hz is reflected back at 192 Hz, what is the speed of the projectile?
31.9 m/sec
20.8 m/sec
27.2 m/sec
22.1 m/sec
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Question 7
In what direction was the projectile in
Question 6
moving relative to the sonar device?
cannot be determined
away from the sonar
towards the sonar
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William A. Hilburn
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