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  4. Three sound waves of equal amplitudes have frequencies (n - 1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be

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Q. Three sound waves of equal amplitudes have frequencies $(n - 1), n, (n + 1)$. They superimpose to give beats. The number of beats produced per second will be

NEETNEET 2016Waves

Solution:

Maximum difference of frequency
$= (n + 1) - (n - 1) = 2$