Q24 of 36 Page 109

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?

Given:


Frequency of first wave = n1


Frequency of second wave = n2


Let n1>n2. When these two waves interfere having slightly different frequencies they will produce beats. The beat frequency would be



The time period of the beat is equal to the time interval between successive maxima therefore,



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