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A tuning fork arrangement (pair) produce...

A tuning fork arrangement (pair) produces `4 beats//sec` with one fork of frequency `288cps`. A little wax is placed on the unknown fork and it then produces `2 beats//sec`. The frequency of the unknown fork is

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Unknow freq.=Known freq.I Beat freq.
`=284pm 4=292 or 284 Hz` On putting wax , feq. Decreases, beat freq. is also decreases to 2`therefore` unknown freq. `=292 Hz` (higher one).
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