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A source of unknown frequency gives 4 be...

A source of unknown frequency gives 4 beats//s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 The unknown frequency is

A

`246Hz`

B

`240Hz`

C

`260Hz`

D

`254Hz`

Text Solution

Verified by Experts

The correct Answer is:
D
`n-250=4`
`513-2n=5`
solving `n=254`
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