An ambulance travels down a high way at a speed of 75.0 mi/h, its siren emitting sound at a frequency of 400 Hz. What frequency is heard by a passenger in a car travelling at 55.0 mi/h in the opposite direction as the car (a) approaches? (b) Moves away from the ambulance?

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Physics

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11 May, 00:14

An ambulance travels down a high way at a speed of 75.0 mi/h, its siren emitting sound at a frequency of 400 Hz. What frequency is heard by a passenger in a car travelling at 55.0 mi/h in the opposite direction as the car (a) approaches? (b) Moves away from the ambulance?

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Jair Johnson · Answer 1

For speed of sound of c=340m/s:

f'=f ((c+Vr) / (c+Vs)) where Vr is speed of receiver ( + if moving towards source) and Vs is speed of source ( + if moving away from receiver)

So A) 596Hz

B) 275Hz