Question

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?

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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