First slide

Doppler's effect

Question

The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 330 m/s)

Easy

A

600 cps
B

660 cps
C

990 cps
D

330 cps

Solution

$n' = n (\frac{v}{v - v_{S}}) = 600 (\frac{330}{300}) = 660 cps$

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