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While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, the measures the column length to be x cm for the second resonance, then

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36 > x > 18

x > 54

54 > x > 36

18 > x

answer is B.

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Detailed Solution

$l_{1} = \frac{v_{1}}{4 n}$ ; $l_{2} = \frac{3 v_{2}}{4 n}$

In summer velocity of sound increases.
So, $l_{2} > 3 l_{1}$

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