Q.

An open pipe of sufficient length is dipping in water with a speed v vertically. If at any instant l  is length of tube above water, then the rate at which fundamental frequency of pipe changes, is(speed of sound =c)

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a

cv/2l2

b

cv/4l2

c

c/2v2l2

d

c/4v2l2

answer is B.

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Detailed Solution

Fundamental frequency  n=c4ldndt=-c4l2dldt=cv4l2
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