First slide

Doppler's effect

Question

An observer is moving away from source of sound of frequency 100 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the observed frequency is

Easy

A

90 Hz
B

100 Hz
C

91 Hz
D

110 Hz

Solution

$n' = n (\frac{v - v_{O}}{v}) = (\frac{330 - 33}{330}) \times 100 = 90 Hz$

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