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Question
A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 ms–1. The frequency heard by the observer is (speed of sound = 330 ms–1) ______.
Solution
Data:
v = 330 ms-1
vS = 33 ms-1
n = 450 Hz
n’ =?
Apparent frequency
n' = `("v"/("v"-"v"_s))` n
= `(330/(330-33))xx`450 = 1.11 x 450
n' = 500 Hz.
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