First slide

Doppler

Question

A siren emitting sound of 1000 Hz is moving away from us towards a high hill with velocity 10 m/s. The frequency of sound reflected from the hill will be $(V = 330 m / s)$

Moderate

A

100Hz
B

130 Hz
C

1031.25Hz
D

1200Hz

Solution

see fig
$n^{'} = \frac{n v}{v - v_{s}} = \frac{1000 \times 330}{330 - 10} = 1031 \cdot 25 H z$

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