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.
Before beginning any given worksheet, please look over all of the questions and make sure that there are
no duplicate
answers shown for the same question. If duplicates are present simply refresh the page until every answer is unique.
In order to check an answer
(even when you are just starting the worksheet on Question 1)
it is necessary to
any questions that you have not answered. Once you start submitting answers, the page may be checked as many times as necesasary without changing the randomized answers. Relevant scoring will be provided at the top of the page only when you answer all of the questions on your original submission.
omit
Question 1
A 'clicker' is sounding at 15 Hz; if you are moving towards the 'clicker' at 21 m/sec what apparent frequency do you hear instead?
25.71 Hz
4.29 Hz
15.93 Hz
14.07 Hz
omit
Question 2
You are riding a bike away from a street musician at 10.5 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?
426 Hz
454 Hz
448 Hz
432 Hz
omit
Question 3
You are in an ambulance driving towards an accident at 33 m/sec. You hear the horns of the cars in the accident sounding at a frequency of 527 Hz, what is the actual frequency of the car horns.
578 Hz
584 Hz
476 Hz
480 Hz
omit
Question 4
You are riding in a boat into oncoming waves and measure the frequency of the waves to be 21 crests every 10 seconds. Shortly afterwards you come to rest on the water and measure the waves to have an actual frequency of 10 every 10 seconds with a wave speed of 11 m/sec. How fast was your boat traveling before?
34.1 m/sec
10.0 m/sec
3.5 m/sec
12.1 m/sec
omit
Question 5
You are speeding away from a loud speaker. If the original frequency of 527 Hz is shifted to 494 Hz, what is your speed away from the speaker?
23 m/sec
21.3 m/sec
32 m/sec
10 m/sec
omit
Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 263.5 Hz is reflected back at 253 Hz, what is the speed of the projectile?
13.5 m/sec
32.4 m/sec
32.6 m/sec
14.1 m/sec
omit
Question 7
In what direction was the projectile in
Question 6
moving relative to the sonar device?
towards the sonar
cannot be determined
away from the sonar
Copyright © 2007-2026
William A. Hilburn
All rights reserved.
Application Programmer
Mark Acton