Multiple choice

Which of the following statements is true?

  1. Radiation is a form of heat

  2. Good radiators are good reflectors

  3. A material medium is not essential for convection

  4. A rough surface is better absorber of heat than polished one
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rough surfaces have a larger effective surface area and can trap radiation through multiple internal reflections, making them better absorbers than smooth, polished surfaces which reflect most incident radiation.

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