"An airplane traveling at one third the speed of sound (i. e., 114 m/s) emits a sound of frequency 3.65 kHz. At what frequency does a stationary listener hear the sound as the plane approaches? Answer in units of kHz."

Explanation:

velocity of source, Vs = 114 m/s

original frequency, f = 3.65 kHz

velocity of observer , Vo = 0 m/s

velocity of sound, v = 334 m/s

let the frequency is f'.

The formula for the doppler effect is given by

where, v is the velocity of sound.

f' = 5.54 kHz

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