Which of the following will radiate heat to a large extent?

Rough surface

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Polished surface

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Black rough surface

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Black polished surface

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Solution

The correct option is C Black rough surface
A black body absorbs maximum heat and hence radiates maximum heat. If the surface is shiny then the heat gets reflected back and the absorption of heat is very less. Hence a black non-shiny or rough body would radiate maximum heat.

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