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 16 Hz; if you are moving towards the 'clicker' at 25 m/sec what apparent frequency do you hear instead?
5.76 Hz
14.82 Hz
26.24 Hz
17.18 Hz
omit
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?
430 Hz
456 Hz
424 Hz
450 Hz
omit
Question 3
You are in an ambulance driving towards an accident at 36 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 329 Hz, what is the actual frequency of the car horns.
364 Hz
294 Hz
298 Hz
368 Hz
omit
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 11 every 10 seconds with a wave speed of 12 m/sec. How fast was your boat traveling before?
9.4 m/sec
3.7 m/sec
39.3 m/sec
15.3 m/sec
omit
Question 5
You are speeding away from a loud speaker. If the original frequency of 329 Hz is shifted to 293 Hz, what is your speed away from the speaker?
9 m/sec
37.2 m/sec
30 m/sec
42 m/sec
omit
Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 164.5 Hz is reflected back at 152 Hz, what is the speed of the projectile?
28.0 m/sec
25.8 m/sec
31.4 m/sec
27.2 m/sec
omit
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
Copyright © 2007-2019
William A. Hilburn
All rights reserved.
Application Programmer
Mark Acton