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A man is running with a fork of frequency 340 Hz towards a huge wall with a velocity 2m/s, then the number of beats heard per second is (Velocity of sound in air is 342 m/s)

A

2

B

6

C

4

D

8

Text Solution

Verified by Experts

The correct Answer is:
C
`n' = n [(v + v_(0))/(v - v_(s))] = 340 [(342 + 2)/(342 - 2)]`
`n' = 344`
`n_(1) = n' - n`
`= 344 - 340 = 4`
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