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A closed organ pipe and an open organ pipe of same length produce 2 beats/second while vibrating in
\( \mathrm{P} \) their fundamental modes. The length of the open

W 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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