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 the 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
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For a closed organ pipe, the frequency of fundamental mode is
Where 
is the length of the open pipe
(Given)
….. (i)
(Given) ….. (ii)
Solving (i) and (ii) we get
When the length of the open pipe is halved, its frequency of fundamental mode is
When the length of the closed pipe is doubled, its frequency of fundamental mode is
Hence, number of beats produce per seconds
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