Match List - I with List - II

List-I	List-II
(a) Ultraviolet rays	(i) Study crystal structure
(b) Microwaves	(ii) Greenhouse effect
(c) Infrared waves	(iii) Sterilizing surgical instrument
(d) X-rays	(iv) Radar system

Let us match each electromagnetic wave with its correct application:

(a) Ultraviolet rays - (iii) Sterilizing surgical instruments: UV rays have germicidal properties and are widely used to sterilize surgical instruments by killing bacteria and viruses.

(b) Microwaves - (iv) Radar system: Microwaves are used in radar systems (RADAR - Radio Detection and Ranging) for detecting objects and measuring distances.

(c) Infrared waves - (ii) Greenhouse effect: Infrared waves are responsible for the greenhouse effect. The Earth absorbs solar radiation and re-emits it as infrared radiation, which is trapped by greenhouse gases.

(d) X-rays - (i) Study crystal structure: X-rays are used in X-ray diffraction to study crystal structures (Bragg's law).

The correct matching is: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i).

The correct answer is Option A.