Bottom of a lake is at \( 0^{\circ} \mathrm{C} \) and atmospheric P...

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Bottom of a lake is at \( 0^{\circ} \mathrm{C} \) and atmospheric
P temperature is \( -20^{\circ} \mathrm{C} \). If \( 1 \mathrm{~cm} \) ice is formed on the

W. surface in \( 24 \mathrm{~h} \), then time taken to form next \( 1 \mathrm{~cm} \) of ice is
(1) \( 24 \mathrm{~h} \)
(2) \( 72 \mathrm{~h} \)
(3) \( 48 \mathrm{~h} \)
(4) \( 96 h \)
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