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Question
When two waves of almost equal frequencies n1 and n2 reach at a point simultaneously, what is the time interval between successive maxima?
Solution
If two waves of almost equal frequencies interfere, they are producing beats.
Let n1 > n2
Beat frequency `f_"beat"` = n1 – n2
∴ Time periods of beats Tbeats = `1/f_"beat" = 1/(n_1 - n_2)`
This time period will be equal to the time interval between successive maxima.
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