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 18 Hz; if you are moving towards the 'clicker' at 28 m/sec what apparent frequency do you hear instead?
19.48 Hz
29.57 Hz
6.43 Hz
16.52 Hz
omit
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
429 Hz
451 Hz
422 Hz
omit
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 694 Hz, what is the actual frequency of the car horns.
631 Hz
757 Hz
764 Hz
636 Hz
omit
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 13 every 10 seconds with a wave speed of 10.3 m/sec. How fast was your boat traveling before?
11.9 m/sec
8.9 m/sec
32.5 m/sec
3.3 m/sec
omit
Question 5
You are speeding away from a loud speaker. If the original frequency of 694 Hz is shifted to 663 Hz, what is your speed away from the speaker?
15.2 m/sec
32 m/sec
11 m/sec
16 m/sec
omit
Question 6
You are measuring the speed of a projectile using sonar. If a frequency of 347 Hz is reflected back at 333 Hz, what is the speed of the projectile?
32.6 m/sec
24.3 m/sec
13.7 m/sec
14.3 m/sec
omit
Question 7
In what direction was the projectile in
Question 6
moving relative to the sonar device?
cannot be determined
towards the sonar
away from the sonar
Copyright © 2007-2018
William A. Hilburn
All rights reserved.
Application Programmer
Mark Acton