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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