lZ) Describe the process of heat transfer by radiation.

How is heat transferred by radiation?

Radiation heat transfer is the energy that is emitted by matter in the form of photons or electromagnetic waves. Radiation can be important even in situations in which there is an intervening medium. An example is the heat transfer that take place between a living entity with its surrounding.

Radiation refers to the transfer of heat from a hot body to cold body directly, without heating the medium between two bodies. The radiant heat is of the form of electromagnetic waves. These waves can travel in vacuum in all directions in a straight line with the speed of light. Heat radiations are also called infra-red radiations because the wavelength of heat radiations is longer than that of visible light.