A tuning fork of frequency 380 Hz is moving towards a wall with a velocity of 4

Question

A tuning fork of frequency 380 Hz is moving towards a wall with a velocity of 4 m/s. Then the number of beats heard by a stationary listener between direct and reflected sounds will be (velocity of sound in air is 340 m/s)

Options:

A . 0

B . 5

C . 7

D . 10

Answer: Option A
:
A
The frequency of direct and reflected sound is same.

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