Match List I with List II: array llll ; & List-I (Electromagnetic wave) & ; & List-II (Production) A. & Microwave & I. & Electrons in atoms emit light when they move from a higher energy level to a lower energy level. B. & Visible light & II. & Radioactive decay of nucleus C. & Gamma rays & III. & Vibration of atoms and molecules D. & Infra-red rays & IV. & Klystron valve or magnetron valve array

1. A. A–IV, B–III, C–II, D–I
2. B. A–III, B–IV, C–I, D–II
3. C. A–III, B–I, C–II, D–IV
4. D. A–IV, B–I, C–II, D–III

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