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Q.

A pipe open at both ends produces a note of frequency f1 .When the pipe is kept with 34 th of its length it water, it produced a note of frequency f2. The ratio f1f2 is :

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a

34

b

43

c

12

d

2

answer is C.

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Detailed Solution

For open pipe f1=v2l and for closed pipef2=v4×l4=vl=2f1⇒f1f2=12

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A pipe open at both ends produces a note of frequency f1 .When the pipe is kept with 34 th of its length it water, it produced a note of frequency f2. The ratio f1f2 is :