A _____________ surface has the maximum thermal emissivity out of the following ?
Correct answer: B. Black & rough
- A. Black & smooth
- B. Black & rough
- C. White & smooth
- D. White & rough
Explanation
A black surface absorbs and emits radiation strongly, while a rough surface generally has higher emissivity than a polished smooth surface. Hence, a black and rough surface has the greatest emissivity among these choices.
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