Ultra violet (UV)

a. Ultraviolet generated by atoms and molecules are electrically charged and sun (ultraviolet radiation as a source of potential growth). Ultraviolet radiation from the sun interact with the atoms of the upper atmosphere resulting ions are very much at an altitude of more than 80 km layer called the ionosphere

b. UV is used to kill microorganisms. Ultraviolet radiation that is absorbed will destroy microorganisms such as the chemical reaction due to ionization and dissociation of molecules

c. Ultraviolet light can change the molecules of provitamin D sterol into vitamin D.