Question

Which of the following will radiate heat to large extent? (a) Rough surface (b) Polished surface (c) Black rough surface (d) Black polished surface

Answer 1

(c) Black rough surface will radiate heat to large extent.

Why will black rough surface radiate heat to large extent?

• Scientific observations have proved that maximum radiation is absorbed by black surfaces. As a result, maximum heat will also be radiated by a black surface.

• For a shiny substance, heat absorbed will be less as maximum heat gets reflected back from a shiny object.

• Hence, a black rough surface will absorb and radiate most heat.

Answer 2

Explanation:

(c) Black rough surface is the right answer