A smart farmer fills up his field entirely with water on an extremely cold night. Why?

As water has low SHC and liberates a large amount of heat on cooling

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As water has high SHC and liberates a large amount of heat on cooling

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As water has low SHC and liberates a small amount of heat on cooling

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As water has high SHC and liberates a small amount of heat on cooling

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As water is a very good conductor of heat and hence transmit large amount of heat

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Solution

The correct option is B
As water has high SHC and liberates a large amount of heat on cooling

Water has a large SHC (4.2 J/g⁰C). Thus when water cools down, it liberates a large amount of heat for a very small drop in temperature. Thus when the farmer fills up his field entirely with water a large amount of heat is given out during cooling of water. This heat is absorbed by the plants & hence plants are prevented them from freezing.

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