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A long tube open at the top is fixed ver...

A long tube open at the top is fixed verticallly and water level inside the tube can be moved up or down . A vibrating tuning fork is held above the open end and the water level is pushed down gradually so as to get first and second resonance at `24.1 cm` and `74.1 cm` , respectively below the open end . The diameter of the tube is

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3 cm
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