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| List-$I$ ($EM$ Wave) | List-$II$ (Wavelength Range) |
| $(A)$ Infrared | $(i)$ $ < 10^{-3} \, nm$ |
| $(B)$ Ultraviolet | $(ii)$ $400 \, nm$ to $1 \, nm$ |
| $(C)$ $X$-rays | $(iii)$ $1 \, mm$ to $700 \, nm$ |
| $(D)$ Gamma rays | $(iv)$ $1 \, nm$ to $10^{-3} \, nm$ |
| 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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