21.What do we call an ideal body which emits and absorbs all frequencies? [A] Black body [B] White body [C] Red body [D] Zero body Show Answer
The ideal body, which emits and absorbs radiation of all frequencies is called a black body and the radiation emitted by such body is called black body radiation. Analyzing the reason. Reason: The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
