Question

A person at rest perceives a sound at a frequency of 400Hz that comes from a...

A person at rest perceives a sound at a frequency of 400Hz that comes from a sound source that moves away from the person at a v = 25m /s, if the speed of sound in the air is 343m / s, what is the value of the frequency of the sound emitted by the source?


a) 364.6 Hz
b) 433.3Hz
c) 376.6Hz
d) 429.2Hz
e) None

I did it and I got 372, but I want to be sure.

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Homework Answers

Answer #1

Use the equation for Doppler effect for apparent frequency when the source is moving away from the observer to find the required value of original frequency as shown below

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Let me know in the comment section, if something's wrong

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