| List-$I$ | List-$II$ |
|---|---|
| $A.$ Radio-wave | $I.$ Produced by Magnetron valve |
| $B.$ Micro-wave | $II.$ Due to change in the vibrational modes of atoms |
| $C.$ Infrared-wave | $III.$ Due to inner shell electrons moving from higher energy level to lower energy level |
| $D.$ $X$-ray | $IV.$ Due to rapid acceleration of electrons |
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