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.
omit
Question 1
A 'clicker' is sounding at 13 Hz; if you are moving towards the 'clicker' at 22 m/sec what apparent frequency do you hear instead?
20.68 Hz
13.84 Hz
12.16 Hz
5.32 Hz
omit
Question 2
You are riding a bike away from a street musician at 11 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?
426 Hz
449 Hz
432 Hz
454 Hz
omit
Question 3
You are in an ambulance driving towards an accident at 43 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 323 Hz, what is the actual frequency of the car horns.
364 Hz
370 Hz
287 Hz
282 Hz
omit
Question 4
You are riding in a boat into oncoming waves and measure the frequency of the waves to be 22 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 14.3 m/sec. How fast was your boat traveling before?
53.6 m/sec
3.8 m/sec
8.2 m/sec
25.0 m/sec
omit
Question 5
You are speeding away from a loud speaker. If the original frequency of 323 Hz is shifted to 280 Hz, what is your speed away from the speaker?
8 m/sec
45.3 m/sec
52 m/sec
29 m/sec
omit
Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 161.5 Hz is reflected back at 150.5 Hz, what is the speed of the projectile?
30.9 m/sec
24.9 m/sec
23.2 m/sec
31.7 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
Copyright © 2007-2018
William A. Hilburn
All rights reserved.
Application Programmer
Mark Acton