How are infrared waves produced? Why are these referred to as ‘heat waves’? Write their one important use.

Infrared waves are produced by hot bodies and molecules. This band lies adjacent to the low frequency or long wavelength end of the visible spectrum.
Infrared waves are referred to as heat waves, because water molecules present in most materials readily absorb infrared waves (many other molecules, for example, CO2, NH3 also absorb infrared waves). After absorption, their thermal motion increases, that is they heat up and heat their surroundings.
Infrared rays are used in green house effect.  

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