While performing a resonance column experiment to measure the speed of sound, a student gets the firstresonance condition at a column lengthof 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be x cm for the second resonance. Then

A. x < 18

B. x > 54 

C. 18 < x < 36

D. 18 < X < 54

Ans. B

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