First slide

Doppler's effect

Question

A source of frequency 150 Hz is moving in the direction of a person with a velocity of 110 m/s. The frequency heard by the person will be (speed of sound in medium = 330 m/s)

Easy

A

225 Hz
B

200 Hz
C

150 Hz
D

100 Hz

Solution

$n' = \frac{v}{v - v_{s}} \times n = (\frac{330}{330 - 110}) \times 150 = 225 Hz$

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