First slide

Doppler

Question

A wall is moving with constant velocity u towards a fixed source of sound of frequency 'f .The velocity of sound is 'v'. The wavelength of the sound reflected by the wall is

Moderate

A

$\frac{v}{f}$
B

$\frac{v - u}{f}$
C

$\frac{v + u}{f}$
D

$\frac{v - u}{v + u} . \frac{v}{f}$

Solution

Frequency of sound reflected by wall $f^{'} = \frac{v + u}{v} f$
$∴ Wavelength of sound reflected by wall$
$= \frac{v - u}{f^{'}} = \frac{v - u}{v + u} \times \frac{v}{f}$

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