First slide

Doppler's effect

Question

A source of sound of frequency 500 Hz is moving towards an observer with velocity 30 m/s. The speed of sound is 330 m/s. the frequency heard by the observer will be

Easy

A

550 Hz
B

458.3 Hz
C

530 Hz
D

545.5 Hz

Solution

$n' = n (\frac{v}{v - v_{S}}) \Rightarrow n' = 500 (\frac{330}{330 - 30}) = 550 Hz$

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