Match List I with List II:

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

Choose the correct answer from the options given below:

Core Logic

Correlate each electromagnetic wave with its source of production according to the electromagnetic spectrum:

A. Microwaves are produced by special vacuum tubes, specifically klystrons, magnetrons, and Gunn diodes. (Matches IV)

B. Visible light is emitted when atomic electrons undergo transitions from higher to lower energy levels. (Matches I)

C. Gamma rays are universally generated from the radioactive decay of unstable atomic nuclei. (Matches II)

D. Infrared rays (heat waves) are generated by the thermal vibration of atoms and molecules in a substance. (Matches III)

Step 1: Final Conclusion

A arrow$\rightarrow$ IV B arrow$\rightarrow$ I C arrow$\rightarrow$ II D arrow$\rightarrow$ III

Pattern Recognition

Magnetron is the heart of a microwave oven. Gamma always links to nuclear decay. Infrared is synonymous with thermal atomic vibrations.

Chapter Mix

Class 12 Physics: Electromagnetic Waves