Name the types of e.m. 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.
(i) $\gamma$ rays (or X-rays)
(ii) Ultraviolet rays
(iii) Infrared rays
Rays: (radioactive decay of nuclei)
X-rays: (X-ray tubes or inner shell electrons)
UV- rays: (Movement from one inner energy level to another)
Infrared rays : (vibration of atoms and molecules)(Any one)