Question

What is black body radiation

Answer 1

A blackbody refers to an opaque object that emits thermal radiation. A perfectblackbody is one that absorbs all incoming light and does not reflect any. At room temperature, such an object would appear to be perfectly black (hence the termblackbody).

Answer 2

because it is proved that all the surfaces which are rough, dull and dark are more absorptive and they emit more radiations than light colors and the best radiative color is Black.