| Column-I (Types of EM waves) | Column-II (Production) |
| A. Infra-red | P. Rapid vibration of electrons in aerials |
| B. Radio | Q. Electrons in atoms emit light when they move from higher to lower energy level. |
| C. Light | R. Klystron valve |
| D. Microwave | S. Vibration of atoms and molecules |
Choose the correct match from the options given below:
Solution:
Infrared waves are produced by molecular vibrations (A-S). Radio waves by accelerating charges in aerials (B-P). Light waves by atomic transitions (C-Q). Microwaves by klystron/magnetron valves (D-R).
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