Change in frequency when the source is approaching:
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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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the The Doppler Effect concept. You can view video lessons to learn The Doppler Effect. Or if you need more The Doppler Effect practice, you can also practice The Doppler Effect practice problems.