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A fork of unknown frequency when sounded...

A fork of unknown frequency when sounded with one of frequency 288 Hz gives 4 beats per second and when loaded with a piece of wax again gives 4 beats per second. How do you account for this and what was the unknown frequency ?

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Here, `n_(1)=288, m=4,n_(2)=?`
`n_(2)=n_(1)+-m=288+-4=292 or 284`
As frequency decreaes on loading, initial freq. `=292`. On loading, frequency reduces to 284. Therefore, number of beats `//` sec continues to be 4
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