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When two waves of almost equal frequenci...

When two waves of almost equal frequencies `n_(1)` and `n_(2)` reach at a point simultaneously, what is the time interval between successive maxima ?

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Time interval between two successive maxima when two waves having slighly different frequencies `n _(1) and n_(2).` Superpose at some point at some instant of time is,
`T = (1)/( f _(b)) = (1)/( n _(1) - n_(2)) (if n _(1) gt n _(2))`
OR `T =(1)/( f _(b)) = (1)/( n _(2) - n _(1)) (if n _(2) gt n _(1))`
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