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

A

`254 Hz`

B

`246 Hz`

C

`240 Hz`

D

`260 Hz`

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