Radiation is the continual emission of infrared waves from the surface of all bodies, transmitted without the aid of a medium.
Radiation does not need a medium for energy transfer.Thus, radition can take place in a vacuum.
Absorption and Emission of Infrared radiation:
Infrared radiation is absorbed and emitted by all objects.Absorption of infrared radiation causes a rise in temperature while emission of infrared radiation causes a decrease in temperature.
Dull,black surface absorb infrared radiation faster than shiny, white surfaces. They are also better emitters of infrared emitters.
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