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A man driving a car toward a large vertical wal sounds his horn. The car is traveling at 81 km/h. The echo off the wall is heard by the man at a frequency of 958 Hz. What is the frequency of the car's horn?

  • Physics -

    Vc = 81000m/3600s = 22.5 m/s. = Velocity
    of car.

    F = ((V+Vr)/(V+Vc)))*Fh = 958Hz.
    ((345+22.5)/(343-22.5))*Fh = 958
    367.5Fh/322.5 = 958
    1.140Fh = 958
    Fh = 841 Hz. = Freq. of horn.

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