Match List – I with List – II.
| List – I (Type of EM Wave) | List – II (Application) | ||
|---|---|---|---|
| (A) | Microwaves | (I) | Cellular phones |
| (B) | Radiowaves | (II) | Greenhouse effect |
| (C) | Infrared waves | (III) | Eye surgery |
| (D) | Ultraviolet rays | (IV) | Ovens |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
Each part of the electromagnetic spectrum is used according to how its frequency interacts with matter.
(A) Microwaves — this matches (IV) Ovens. Their frequency is close to the natural frequency of water molecules, so food absorbs them and gets heated in a microwave oven.
(B) Radiowaves — this matches (I) Cellular phones. Cellular phones use radio waves in the ultra high frequency (UHF) band to carry voice signals.
(C) Infrared waves — this matches (II) Greenhouse effect. The earth re-radiates the absorbed solar energy as infrared waves, and these are trapped by the atmosphere (and by the glass of a greenhouse), which warms the surface.
(D) Ultraviolet rays — this matches (III) Eye surgery. A narrow, intense beam of ultraviolet light is used in the LASIK procedure to correct the shape of the cornea.
NCERT (2026-27):
Microwaves – “… Microwave ovens are an interesting domestic application of these waves.”
Radio Waves – “… Cellular phones use radio waves to transmit voice communication in the ultrahigh frequency (UHF) band.”
Infrared Waves – “… Infrared radiation also plays an important role in maintaining the earth’s warmth or average temperature through the greenhouse effect.”
Ultraviolet Rays – “… Due to its shorter wavelengths, UV radiations can be focussed into very narrow beams for high precision applications such as LASIK (Laser- assisted in situ keratomileusis) eye surgery.”