Question

What are the factors affecting the rate at which the energy radiated by a body?

Answer 1

The amount of radiation emitted by a body depends on its temperature, and is proportional to T4. This relation shows that as the temperature of the object increases, the amount of radiation emitted increases very rapidly.

Answer 2

All objects with a temperature above absolute zero (0 K, -273.15 oC) emit energy in the form of electromagnetic radiation. A blackbody is a theoretical or model body which absorbs all radiation falling on it, reflecting or transmitting none.