First slide

Doppler

Question

Suppose that the speed of sound in air at a given temperature is 400 m/sec. An engine blows a whistle at 1200 Hz frequency. It is approaching an observer at the speed of 1oo m/sec. What is the apparent frequency as heard by the observer

Moderate

A

600Hz
B

1200 Hz
C

1500Hz
D

1600Hz

Solution

When engine is approaching the observer
$n^{'} = (\frac{v}{v - v_{s}}) n = (\frac{400}{400 - 100}) \times 1200 = 1600 Hz$

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