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Q.

If l1 are l2 the lengths of an air column for the first and second resonance when a tuning fork of frequency n is sounded on a resonance tube, then the minimum distance of the anti-node from the top end of the resonance tube is

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a

l2+l12

b

12(2l1−l2)

c

2(l2−l1)

d

l2−3l12

answer is C.

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Detailed Solution

l1+x=λ/4 ; l2+x=3λ4⇒x=l2−3l12

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