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, she measures the column length to be $x\,cm$ for the second resonance. Then
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In second resonance $x = 3L_1 = 54$ but during summer temp. increases so velocity of sound increases.
$\therefore x > 3L_1$
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