First slide

Doppler's effect

Question

The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity 50 m/s. The apparent frequency in cps heard by the observer will be

Easy

A

600
B

1050
C

1400
D

2400

Solution

$n' = n (\frac{v}{v - v_{s}}) = 1200 \times (\frac{350}{350 - 50}) = 1400 cps$

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