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On a cold winter day, the atmosheric tem...

On a cold winter day, the atmosheric temperature is -theta (on celsium scale) which is below `0^(@)C. A cylindrical drum oof height h made of a bad conductor is completely filled with water at 0^(@)C and is kept outside without any lid. Calculate the time taken for the whole mass of water to freeze. Thermal conductivity of ice is K and its laternt heat of fusion is L. Neglect expansion of water on freezing.

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