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A closed organ pipe and an open pipe of the same length produce four beats per second when sounded together. If the length of the closed pipe is increased, then the number of beats will __________

(a) Increase

(b) Decrease

(c) Remain the same

(d) First decrease then remain the same

1 Answer

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Best answer
Correct answer is (a) Increase

To explain I would say: γopen-γclosed=γ/(2Lopen)-γ/(4Lclosed)

=Beat frequency

Clearly, if the length of the closed pipe is increased, then the beat frequency will increase.

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