In a resonance column experiment, the first resonance is obtained when the level of the water in the tube is at 20 cm from the open end. Resonance will also be obtained when the water level is at a distance of

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40 cm from the open end

60 cm from the open end

80 cm from the open end

100 cm from the open end

answer is B.

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Detailed Solution

For second resonancel2=3λ4=3l1l1=λ/4= first resonance length l2=3×20=60cm