Match List-I with List-II
| List-I | List-II |
| Electromagnetic Waves | Production |
| (A) Ultraviolet rays | (I) Radioactive decay of the nucleus. |
| (B) Infrared waves | (II) Transition of inner shell electrons in atoms from a higher energy level to a lower energy level |
| (C) Gamma rays | (III) Magnetron valve |
| (D) Microwaves | (IV) Vibrations of atoms and molecules |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A) - (II), (B) - (IV), (C) - (I), (D) - (III)
Each part of the electromagnetic spectrum comes from a different physical process.
(A) Ultraviolet rays — this matches (II) Transition of inner shell electrons in atoms from a higher energy level to a lower energy level. UV is emitted when electrons in atoms make transitions to lower energy levels.
(B) Infrared waves — this matches (IV) Vibrations of atoms and molecules. Hot bodies emit it because their atoms and molecules vibrate.
(C) Gamma rays — this matches (I) Radioactive decay of the nucleus. An excited nucleus left after radioactive decay falls to a lower nuclear energy level.
(D) Microwaves — this matches (III) Magnetron valve. Special vacuum tubes such as the magnetron produce them.
Note: Strictly, transitions of inner-shell electrons in heavy atoms produce X-rays; ultraviolet comes mainly from outer-electron transitions. The question can still be solved, because every option matches (A) with (II), and Option (1) is the only option containing (B)–(IV), (C)–(I) and (D)–(III).
NCERT (2026-27):
Gamma Rays – …
