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A closed pipe is suddenly opened and cha...

A closed pipe is suddenly opened and changed to an open pipe of same length.The fundamental frequency of this open pipe is less than the ` 3^( rd )` harmonic of the earlier closed pipe by 55 Hz.The value of the fundamental frequency of the closed pipe is
(A) 55Hz
(B) 110Hz
(C) 330Hz
(D) 55/3 Hz

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