First slide

Doppler's effect

Question

A source of sound of frequency 450 cycles/sec is moving towards a stationary observer with 34 m/sec speed. If the speed of sound is 340 m/sec, then the apparent frequency will be

Easy

A

410 cycles/sec
B

500 cycles/sec
C

550 cycles/sec
D

450 cycles/sec

Solution

$n' = n (\frac{v}{v - v_{0}}) = 450 (\frac{340}{340 - 34}) = 500 cycles / \sec$

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