The Doppler Effect Video Lessons

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Problem: A student knows that an ambulance siren has a frequency of fs = 399 Hz. He measures, when the ambulance is approaching him.  The frequency fo = 414 Hz. Assume the speed of sound is v = 343 m/s in this problem.(a) Input an expression for the ambulance's speed, vs, in terms of the frequencies and the speed of sound v (b) What is this speed, in meters per second? 

FREE Expert Solution

Change in frequency when the source is approaching:

f0=vv - vsfs

(a)

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Problem Details

A student knows that an ambulance siren has a frequency of fs = 399 Hz. He measures, when the ambulance is approaching him.  The frequency fo = 414 Hz. Assume the speed of sound is v = 343 m/s in this problem.

(a) Input an expression for the ambulance's speed, vs, in terms of the frequencies and the speed of sound v 

(b) What is this speed, in meters per second? 

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