When two waves of almost equal frequencies

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:

It is given that the two frequencies are almost equal, that is n1 = n2.

For the formation of the beats, the frequencies must be n2 > n1.

The no.of frequencies per second in maxima = n = n2 – n1

Therefore, the time period of the maxima = 1/n = 1/n2 – n1 second.

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