Let `n_(1) and n_(2)` be the two slightly different frequencies of two sound waves. The time interval between waxing and immediate next waning is
A. `(1)/(n_(1)-n_(2))`
B. `(2)/(n_(1)-n_(2))`
C. `(n_(1)-n_(2))/(2)`
D. `(1)/(2(n_(1)-n_(2)))`

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`(1)/(2(n_(1)-n_(2)))`

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