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Q.

In resonance column apparatus to find velocity of sound in air, 1st resonance occurs at air column of length l1= 16 cm  for given tuning fork, the second resonating length (l2) of air column is (consider end correction)

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a

l2<48 cm

b

l2=32 cm

c

l2>48 cm

d

l2=48 cm

answer is B.

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Detailed Solution

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l2-l1=λ2=2l1+e=2l1+2e

⇒l2=3l1+2e ⇒l2>3l1

 l2> 48 cm

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