Question: Q. 4. Name the types of EM radiations which (i) are used in destroying cancer cells, (ii) cause tanning of the skin and (iii) maintain the earth’s warmth. Write brieflya method of producing any one of these waves. U [O.D. I, II, III 2015]
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Solution:
Ans.(i) rays (or X-rays)
$1 / 2$
(ii) Ultraviolet rays
$1 / 2$
(iii) Infrared rays
Production :
$\gamma$-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) $1 / 2$
[CBSE Marking Scheme 2015]
