First slide

Doppler

Question

A bus is moving with a velocity of 5 m/s towards a huge wall. The driver sounds a horn of frequency 165 Hz. If the speed of sound in air = 335 m/s, the number of beats heard per second by a passenger on the bus will be

Easy

A

3
B

4
C

5
D

6

Solution

Here
$n^{'} = n (\frac{v + u}{v - u}) = 165 (\frac{335 + 5}{335 - 5}) = 170 Hz Number of beats = n - n = 170 - 165 = 5$

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