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(B) The frequencies of the three sound waves are $f_1 = n - 1$,$f_2 = n$,and $f_3 = n + 1$.Beats are produced by the superposition of waves with diffe

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(B) The frequencies of the three sound waves are $f_1 = n - 1$,$f_2 = n$,and $f_3 = n + 1$.Beats are produced by the superposition of waves with different frequencies.The beat frequencies between pairs of waves are:$|f_2 - f_1| = |n - (n - 1)| = 1 	ext{ Hz}$$|f_3 - f_2| = |(n + 1) - n| = 1 	ext{ Hz}$$|f_3 - f_1| = |(n + 1) - (n - 1)| = 2 	ext{ Hz}$The resultant beat frequency is the greatest common divisor or the effective frequency of the superposition,which is determined by the difference between the extreme frequencies.The number of beats produced per second is the difference between the maximum and minimum frequencies: $(n + 1) - (n - 1) = 2 	ext{ Hz}$.

Three sound waves of equal amplitudes have frequencies $(n - 1)$,$n$,and $(n + 1)$. They superimpose to produce beats. The number of beats produced per second is:

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