First slide

Doppler's effect

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 100 m/sec. What is the apparent frequency as heard by the observer

Easy

A

600 Hz
B

1200 Hz
C

1500 Hz
D

1600 Hz

Solution

$n' = n (\frac{v}{v - v_{S}}) = 1200 (\frac{400}{400 - 100}) = 1600 Hz$

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