First slide

Doppler's effect

Question

A Siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s, frequency of the sound to be heard by the listener is (take velocity of sound as 330 m/s)

Easy

A

733.3 Hz
B

644.8 Hz
C

481.2 Hz
D

286.5 Hz

Solution

$n' = n (\frac{v}{v + v_{S}}) = 800 (\frac{330}{330 + 30}) = 733 .33 Hz$

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