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Question
Let n1 and n2 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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Solution
(d) `1/(2(n_1-n_2))`
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