Ice starts forming in lake with water at 0ºC and when the atmospheric temperature is –10ºC. If the time taken for 1 cm of ice be 7 hours, then the time taken for the thickness of ice to change from 1 cm to 2 cm is
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a
7 hours
b
14 hours
c
Less than 7 hours
d
More than 7 hours
answer is D.
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Detailed Solution
t α( y22-y21) Now layer of Ice produce some resistance to heat flow