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Question

An organ pipe P1 closed at one end and vibrating in its first overtone pipe P2 open at booth ends vibrating in its third overtone are in resonance with a given tuning fork. The ratio of the lengths of P1 to that of P2 is

A
3/8
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B
1/3
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C
1/2
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D
8/3
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Solution

The correct option is B 3/8
First overtone of closed organ pipe:
3λ4=L1

f1=vλ1=3v4L1

Third overtone of open organ pipe:

4λ2=L2

f2=vλ2=2vL2

Given f1=f2

3v4L1 =2vL2

L1L2=38


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