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A closed organ pipe and an open organ pi...

A closed organ pipe and an open organ pipe of same length produce 2 beats/second while vibrating in their fundamental modes. The length of open organ pipe is halved and that of closed pipe is doubled. Then, the number of beats produced per second while vibrating in the fundamental mode is

A

2

B

6

C

8

D

7

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The correct Answer is:
D
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