First slide

Doppler's effect

Question

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

Easy

A

10/9
B

11/10
C

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

${(9 / 10)}^{2}$

Solution

$n' = n (\frac{v}{v - v_{S}}) = n (\frac{v}{v - v / 10}) \Rightarrow \frac{n'}{n} = \frac{10}{9}$

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