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A tunning fork of frequency 512Hz approa...

A tunning fork of frequency 512Hz approaches a wall with a velocity of `4ms^(-1)`. How many beats are produced between the direct and the reflected sound if the velocity of sound is `332 ms^(-1)?`

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The correct Answer is:
`n'=(V-V_(e))n//V-V_(s)=512 xx 332//332 +4=505.9` Hz Reflected `=512 xx 332//328` Beat frequency `=518.24-505.9=12"beats//sec"`.
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