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Q.

Four identical pieces of copper are painted with different types of paints. Which one would you expect to lose heat most rapidly if they are all heated to the same temperature and allowed to coal in vaccum

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a

Painted rough white

b

Painted rough black

c

Painted shiny white

d

Painted shiny black

answer is B.

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Detailed Solution

A rough surface due to its wavyness  has more effective area of heat transfer then a smooth surface A body painted black nearly behaves like a black body and a black body radiates heat at the highest rate.
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