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An ambulance is traveling east at 60.7 m/s. Behind it there is a car traveling along the same direction at 32.3 m/s. The ambulance driver hears his siren at a frequency of 521 Hz.
At what frequency does the driver of the car hear the ambulance’s siren? The velocity of sound in air is 343 m/s. Answer in units of Hz

  • physics - ,

    Fr = (Vs-Vc)/(Vs+Va)*Fa
    Fc = (343-32.3)/(343+60.7)*521 = 401 Hz=
    Freq. heard by car driver.

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