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Q.

Velocity of sound in air is V and the length of organ pipe is L. Po is the mean pressure and ∆P0 is amplitude of pressure variations.

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a

1

b

2

c

3

d

4

answer is B.

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Detailed Solution

For closed pipe, v=(2n+1)v4L and for first overtone, n = 1For open pipe,v=nV2L and for fourth harmonic, n = 4.
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Velocity of sound in air is V and the length of organ pipe is L. Po is the mean pressure and ∆P0 is amplitude of pressure variations.