First slide

Beats

Question

An observer while going on scooter hears sound of two sirens of same frequencies from two opposite directions. If he travels along the direction of one of the siren, then he

Easy

A

Listens resonance
B

Listens beats
C

Will not listen sound due to destructive interference
D

Will listen intensive sound due to constructive interference

Solution

Because of Doppler effect the apparent frequencies reaching the person are different, hence he can observe beats.

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