During superposition of two waves of nearly equal frequencies, beat...

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During superposition of two waves of nearly equal frequencies, beats frequency is defined as the
\( \mathrm{P} \)
(1) Sum of frequencies of interfering waves
W
(2) Number of times the resultant intensity \( \theta \) becomes maximum or minimum in one second
(3) Average of frequencies of interfering waves
(4) Number of times the resultant amplitude becomes maximum or minimum in one second
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