Match List - I with List - II.
| List - I | List - II |
| (A) Microwave | (I) Radar System for Aircraft Navigation |
| (B) UV Rays | (II) To study crystal structure |
| (C) X-Rays | (III) Radioactive decay of Nucleus |
| (D) Gamma-Rays | (IV) Lasik eye surgery |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
Each band of the electromagnetic spectrum is produced in its own way and has uses that suit its wavelength.
(A) Microwave — this matches (I) Radar System for Aircraft Navigation. Microwaves (wavelengths of a few millimetres to centimetres) travel in narrow beams and reflect well from aircraft, so they are used in radar.
(B) UV Rays — this matches (IV) Lasik eye surgery. A finely focused ultraviolet laser beam reshapes the cornea in LASIK surgery.
(C) X-Rays — this matches (II) To study crystal structure. The wavelength of X-rays is comparable to the spacing of atoms in a crystal, so the crystal diffracts them, and the diffraction pattern reveals the arrangement of the atoms.
(D) Gamma-Rays — this matches (III) Radioactive decay of Nucleus. Gamma rays are emitted when an excited nucleus, left behind after alpha or beta decay, falls to a lower energy state.
NCERT (2026-27):
Microwaves – “… Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”
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.”
Gamma Rays – “… This high frequency radiation is produced in nuclear reactions and also emitted by radioactive nuclei.”