InterviewSolution
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InterviewSolution
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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 isA. `5 cm`B. `4 cm`C. `3 cm`D. `2 cm` |
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Answer» Correct Answer - C `f_(1) = (v)/( 4 ( 24.1 + 0.3 D))` `f_(3) = ( 3 v)/( 4 (74.1 + 0.3 D))` `f_(1) = f_(3)` `rArr = (v)/( 4 ( 24.1 + 0.3 D)) = 3 (v)/( 4 (74.1 + 0.3 D))` `3 ( 24.1 + 0.3 D) = 74.1 + 0.3 D` `72.3 + 0.6 D = 74.1 + 0.3 D` `0.6 D = 74.1 - 72.3` `0.6 D = 1.8` `D = (1.8)/(0.6) = 3 cm` |
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