Match the LIST-I with LIST-II
| LIST-I | LIST-II | ||
|---|---|---|---|
| (Electromagnetic waves) | (Production) | ||
| A. | Microwaves | I. | de-excitation of electrons in atoms |
| B. | Gamma rays | II. | Magnetron |
| C. | Infrared waves | III. | Radioactive decay of the nucleus |
| D. | Visible rays | IV. | Vibration of atoms |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A-II, B-III, C-IV, D-I
Each band of the electromagnetic spectrum comes from a different kind of source, from vacuum tubes to nuclei.
(A) Microwaves — this matches (II) Magnetron. Microwaves are produced by special vacuum tubes such as the klystron and the magnetron, and by the Gunn diode.
(B) Gamma rays — this matches (III) Radioactive decay of the nucleus. Gamma rays are emitted when an excited nucleus drops to a lower nuclear energy level.
(C) Infrared waves — this matches (IV) Vibration of atoms. Infrared radiation, often called heat waves, comes from the vibrations of atoms and molecules in hot bodies.
(D) Visible rays — this matches (I) de-excitation of electrons in atoms. Visible light is emitted when electrons in atoms jump from a higher to a lower energy level.
NCERT (2026-27):
Gamma Rays – …
