Match List-I with List-II
| List-I | List-II |
| (EM Waves) | (Production) |
| (A) Infra-Red Rays | (I) Electrons in atoms emit light when they move from one energy level to a lower level. |
| (B) Visible light rays | (II) Radioactive decay of the nucleus |
| (C) Ultraviolet rays | (III) Vibration of molecules |
| (D) Gamma rays | (IV) Inner shell electrons in atoms moving from one energy level to a lower level |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
The source of an electromagnetic wave decides which part of the spectrum it falls in: molecular vibrations, transitions of outer electrons, transitions of inner-shell electrons and nuclear processes give progressively higher frequencies.
(A) Infra-Red Rays — this matches (III) Vibration of molecules. Molecules vibrating and rotating emit at the low energies of the infrared.
(B) Visible light rays — this matches (I) Electrons in atoms emit light when they move from one energy level to a lower level. Transitions of the outer electrons of atoms give visible light.
(C) Ultraviolet rays — this matches (IV) Inner shell electrons in atoms moving from one energy level to a lower level. The larger energy gaps of the inner shells give the higher energy of the ultraviolet.
(D) Gamma rays — this matches (II) Radioactive decay of the nucleus. They are emitted by the nucleus as it passes to a lower energy state.
NCERT (2026-27):
Gamma Rays – …
