Ice starts forming in lake with water at \( 0^{\circ} \mathrm{C} \)...

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Ice starts forming in lake with water at \( 0^{\circ} \mathrm{C} \) and when the atmospheric temperature is \( -10^{\circ} \mathrm{C} \). If the time taken for 1
\( \mathrm{P} \) \( \mathrm{cm} \) of ice be 7 hours, then the time taken for the thickness of ice to change from \( 1 \mathrm{~cm} \) to \( 2 \mathrm{~cm} \) is
W
[MP PMT/PET 1988; UPSEAT 1996; RPMT 2005]
(a) 7 hours
(b) 14 hours
(c) Less than 7 hours
(d) More than 7 hours
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