Radiation



Radiation is the continual emission of infrared waves from the surface of all bodies, transmitted without the aid of a medium.


It is the only process that does not require medium to transfer energy. It can travel in vacuum unlke conduction and convection. Heat rays from the sun reaches Earth due to radiation.


Factors affecting rate of infrared radiation


1) Colour and texture of the surface

- Dull black surfaces absorb and emit inrared radiation easily and are better at it than shiny white surfaces.
- Shiny white surfaces are better reflectors.


2) Surface temperature

-The higher the temperature of the surface of the object relative to the surrounding temperature, the higher the rate of infrared radiation.


3) Surface area