First slide

Doppler's effect

Question

An observer moves towards a stationary source of sound of frequency n. The apparent frequency heard by him is 2n. If the velocity of sound in air is 332 m/sec, then the velocity of the observer is

Moderate

A

166 m/sec
B

664 m/sec
C

332 m/sec
D

1328 m/sec

Solution

$n' = n (\frac{v + v_{0}}{v}) \Rightarrow 2 n = n (\frac{v + v_{0}}{v}) \Rightarrow \frac{v + v_{0}}{v} = 2$
$v_{0} = v = 332 m / \sec$

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