First slide

Beats

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 is 355 m/s, the number of beats heard per second by a passenger on the bus will be

Moderate

A

6
B

5
C

3
D

4

Solution

According the concept of sound image
$n' = \frac{v + v_{B}}{v - v_{B}} \times n = \frac{355 + 5}{355 - 5} \times 165 = 170 Hz$
Number of beats $= n' - n = 170 - 165 = 5$

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