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2nd Law of Thermodynamics

A hot body wi...

Question

A hot body will emit radiations more rapidly if its surface is

A

black and polished

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B

white and polished

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C

black and rough

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D

white and rough

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Solution

The correct option is C black and rough
Radiation heat transfer increases with increase in surface area and emissivity.
Black bodies have highest emissivity (equal to 1) and rough surfaces have higher surface area than polished surfaces. So, black and rough surfaces emit radiations more rapidly.

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