Practice portal › Electromagnetic Waves › Uses of the Bands, and lambda nu = c
Match List-I with List-II.
List-I
(A) UV rays
(B) X-rays
(C) Microwave
(D) Infrared wave
List-II (application)
(i) Diagnostic tool in medicine
(ii) Water purification
(iii) Communication, Radar
(iv) Improving visibility in foggy days
Choose the correct answer from the options given below.
Asked in JEE Main 29th July 1st Shift 2022 · Uses and atmospheric effects
- (1) (A)-(iii), (B)-(ii), (C)-(i), (D)-(iv)
- (2) (A)-(ii), (B)-(i), (C)-(iii), (D)-(iv)
- (3) (A)-(ii), (B)-(iv), (C)-(iii), (D)-(i)
- (4) (A)-(iii), (B)-(i), (C)-(ii), (D)-(iv)
Answer: (2) (A)-(ii), (B)-(i), (C)-(iii), (D)-(iv)
Step-by-step solution
8.4.5: UV lamps are used to kill germs in water purifiers → (ii)
X-rays are the standard diagnostic imaging tool → (i); 8.4.2: microwaves serve radar and communication → (iii)
Infra-red penetrates fog better than visible light, so it improves visibility on foggy days → (iv)
Why the other options are wrong
- (1) comes from gives UV radar and microwave medical diagnosis — the GHz band does no imaging of bone
- (3) comes from gives X-rays fog penetration and infra-red diagnosis, swapping the two medical/optical roles
- (4) comes from gives UV radar and microwave water purification; germicidal action is a UV property
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