A car moving at 20m/s is sounding its horn as it approaches you. If the actual frequency of the horn is 283 Hz, what frequency will you hear at 25.0 degrees C?

Answer 1

F = ((V + Vr) / (V + Vs)) * Fo.

F = ((343 + 0) / (343 + 20)) * 283,

F = (343 / 363) * 283 = 267.4 Hz.

V = Velocity of sound in air.

Vr = Velocity of the receiver.

Vs = Velocity of the source.

Fo = Transmitted frequency of the source.

F = Frequency received by the receiver.