First slide

Doppler's effect

Question

A siren emitting sound of frequency 500 Hz is going away from a static listener with a speed of 50 m/sec. The frequency of sound to be heard, directly from the siren, is

Easy

A

434.2 Hz
B

589.3 Hz
C

481.2 Hz
D

286.5 Hz

Solution

$n^{'} = n (\frac{v}{v + v_{S}}) = 500 \times (\frac{330}{300 + 50}) = 434 .2 Hz$

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