Heat and Thermal ExpansionHard

Question

Ice starts forming in like with water at 0oC when the temperature is - 10oC. If the taken for 1 cm of ice be 7 hours, then the time taken for the thickness of ice to change from 1 cm 2 cm is : -

Options

A.7 hours
B.14 hours
C.less than 7 hours
D.more than 7 hours

Solution

∵ t ∝ (x22 - x12)
For x1 = 0, x2 = 1 cm
7 ∝ (x2 - x2)
For x1 = 1cm, x2 = 2cm
t ∝ (22 - 12) ⇒
⇒ t = 21 hrs

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