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A closed organ pipe and an open organ pipe of same length produce four beats in their fundamental mode when sounded together. If length of the open organ pipe is increased, then the number of beats will -

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Remain constant

Increase

May increase or decrease

Decrease

answer is B.

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Detailed Solution

no – nc =4
where no = v/2l, nc =v/4l; so if length of open organ pipe increases its frequency decreases
so no. of beats also decreases

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