First slide

Doppler

Question

A sound source is moving towards a stationary observer with a speed equal to 1/10 th of the speed of sound. The ratio of apparent to real frequency is

Moderate

A

10/9
B

11/10
C

$(11 / 10)^{2}$
D

$(9 / 10)^{2}$

Solution

$n^{'} = n (\frac{v}{v - v_{s}}) ∴ \frac{n^{'}}{n} = [\frac{v}{v - (v / 10)}] = \frac{10}{9}$

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