39.What is a perfectly black body? [A] A body which absorbs all the radiations incident on it [B] A body which has zero coefficient of linear expansion [C] A body which has zero absorptive power [D] A body painted black on all sides Show Answer
Definition of blackbody : an ideal body or surface that completely absorbs all radiant energy falling upon it with no reflection and that radiates at all frequencies with a spectral energy distribution dependent on its absolute temperature.
