First slide

Doppler's effect

Question

With what velocity an observer should move relative to a stationary source so that he hears a sound of double the frequency of source

Easy

A

Velocity of sound towards the source
B

Velocity of sound away from the source
C

Half the velocity of sound towards the source
D

Double the velocity of sound towards the source

Solution

By using $n^{'} = n (\frac{v - v_{O}}{v - v_{S}})$
$2 n = n (\frac{v - v_{O}}{v - 0}) \Rightarrow v_{O} = - v = -$ (Speed of sound)
Negative sign indicates that observer is moving opposite to the direction of velocity of sound, as shown

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