How are infrared waves produced? Why are these referred to as 'heat waves'? Write their one improtant use.

Explanation

Infrared rays are produced by hot bodies and molecules. Broadly speaking, Laser, Globar, atc. Are the laboratory sources for the production of infrared rays. This may involve vibration and bending of molecules.
Infrated band lies adjacent to low frequency or long wavelength end of the visible spectrum. Innfrared waves are sometimes referred to as heat waves.
Infrared rays are used to take photographs in darkness.