In a vertical U-tube a column of mercury oscillates simple harmonically. If the tube contains \(...

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In a vertical U-tube a column of mercury oscillates simple harmonically. If the tube contains \( 1 \mathrm{~kg} \) of mercury and \( 1 \mathrm{~cm} \) of mercury column weighs \( 20 \mathrm{~g} \), then the period of oscillation is
(a) \( 1 \mathrm{~s} \)
(b) \( 2 \mathrm{~s} \)
(c) \( \sqrt{2} \mathrm{~s} \)
(d) Insufficient data
\( \mathrm{P} \)
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