Question

Define absorptive power of a body. What is the absorptive power of a perfect black body?

Answer 1

: the property of a body that determines the fraction of incident radiation absorbedby the body
A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic radiation called black-body radiation. The radiation is emitted according to Planck's law, meaning that it has aspectrum that is determined by thetemperature alone (see figure at right), not by the body's shape or composition.