A car is traveling on a street at 24.6 m/s. An ambulance is behind the car, movi

Question

A car is traveling on a street at 24.6 m/s. An ambulance is behind the car, moving in the same direction and with a speed of 38.7 m/s. The siren on the ambulance is emitting sound at a frequency of 1575 Hz. The speed of sound in the air is 343 m/s. A) What is the frequency of the siren heard by a person in the car? B) The driver of the car notices the ambulance, and slows down to 12.8 m/s. The ambulance passes the car and is moving away from the car. What frequency of the siren does a person in the car hear now?

Explanation / Answer

frequency f1 = {c-V0/C-Vs}f

               f1 = (343 - 24.6)/(343-38.7) * 1575

                    = 1647 Hz

b. f2 = (343-12.8)/(343-38.7) * 1575

         = 1709 Hz

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