There are three sources of sound of equa...

There are three sources of sound of equal intensity with frequencies 400, 401 and 402 vib/sec . The number of beats heard per second is

zero

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The correct Answer is:

`n_(1)=401 Hz, n_(2) =402` Hz and `n_(3)=403` Hz
`:.` Beats `=n_("max")-n_("min")`
`=403-401=2 sec^(-1)`

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