Match the LIST-I with LIST-II
| LIST-I | LIST-II | ||
| (Electromagnetic waves) | (Uses) | ||
| A. | Microwaves | I. | Used in medicine to destroy cancer cells |
| B. | Gamma rays | II. | Used to treat muscular strain |
| C. | Radio waves | III. | Used for aircraft navigation |
| D. | Infrared rays | IV. | Voice communication in UHF band |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A - III, B - I, C - IV, D - II
Each use follows from the wavelength band and how that radiation interacts with matter.
(A) Microwaves — this matches (III) Used for aircraft navigation. Their short wavelength suits radar systems used in aircraft navigation.
(B) Gamma rays — this matches (I) Used in medicine to destroy cancer cells. Their very high photon energy kills cells, which is used in radiotherapy.
(C) Radio waves — this matches (IV) Voice communication in UHF band. The ultra high frequency band (300 MHz to 3000 MHz) of radio waves carries cellular phone (voice) communication.
(D) Infrared rays — this matches (II) Used to treat muscular strain. Infrared lamps produce heat in the tissues, which is used in physical therapy.
NCERT (2026-27):
Radio Waves – “… Cellular phones use radio waves to transmit voice communication in the ultrahigh frequency (UHF) band.”
Microwaves – “… Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”
Infrared Waves – “… Infrared lamps are used in physical therapy.”
Gamma Rays – “… This high frequency radiation is produced in nuclear reactions and also emitted by radioactive nuclei. They are used in medicine to destroy cancer cells.”