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 17 Hz; if you are moving towards the 'clicker' at 28 m/sec what apparent frequency do you hear instead?
18.40 Hz
15.60 Hz
27.32 Hz
6.68 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 32 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 441 Hz, what is the actual frequency of the car horns.
403 Hz
399 Hz
487 Hz
483 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 12 every 10 seconds with a wave speed of 10.7 m/sec. How fast was your boat traveling before?
3.2 m/sec
35.7 m/sec
14.3 m/sec
8.0 m/sec
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Question 5
You are speeding away from a loud speaker. If the original frequency of 441 Hz is shifted to 409 Hz, what is your speed away from the speaker?
32 m/sec
11 m/sec
27 m/sec
24.7 m/sec
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Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 220.5 Hz is reflected back at 206.5 Hz, what is the speed of the projectile?
24.3 m/sec
23.1 m/sec
31.8 m/sec
21.6 m/sec
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Question 7
In what direction was the projectile in
Question 6
moving relative to the sonar device?
away from the sonar
cannot be determined
towards the sonar
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