Question

Name the electromagnetic waves used for following and arrange them in increasing order of their penetrating power:
(a)water purification (b) remote sensing
(c) treatment of cancer.

Answer 1

(a) For water purification, ultraviolet rays are
used.
(b) For remote sensing, microwaves are used
(c) For treatment of cancer, `gamma`-rays are used.
Order of penetrating power of these radiations
microwavesltultraviolet rays lt`gamma`-rays.