Name the types of electromagnetic radiations which (i) are used in destroying cancer cells, (ii) cause tanning of the skin, and (iii) maintain the earth.s warmth.
Write briefly a method of producing any one of these waves.

Explanation

(i) `gamma-`rays are used in destroying cancer cells. These are produced in nuclear reactions and are emitted by certain radioactive materials.
(ii) UV radiations cause tanning of the skin. These are produced by special UV lamps.
(iii) IR rays maintain the earth.s warmth. These are produced by all hot bodies.