First slide

Doppler's effect

Question

What should be the velocity of a sound source moving towards a stationary observer so that apparent frequency is double the actual frequency (Velocity of sound is v)

Easy

A

v
B

2v
C

$\frac{v}{2}$
D

$\frac{v}{4}$

Solution

By using $n' = (\frac{v}{v - v_{S}}) \Rightarrow 2 n = n (\frac{v}{v - v_{S}}) \Rightarrow v_{S} = \frac{v}{2}$

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