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Questions  

Third overtone of closed organ pipe is in unison with fourth harmonic of an open pipe. Find the ratio of the lengths of the pipes.

a
8/9
b
3/2
c
7/8
d
½

detailed solution

Correct option is C

Third overtone of closed organ pipe means seventh harmonic.  Given :  f7  closed  = f4 open  ⇒7V4lc=4V2lo ⇒lclo=78

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