Match the LIST-I with LIST-II
$$\begin{array}{|l|l|l|l|}\hline & \text{List-I} & & \text{List-II} \\ \hline \text{A.} & \text{Radio-wave} & \text{I.} & \text{is produced by Magnetron valve} \\ \hline \text{B.} & \text{Micro-wave} & \text{II.} & \text{due to change in the vibrational modes of atoms} \\ \hline \text{C.} & \text{Infrared-wave} & \text{III.} & \text{due to inner shell electrons moving from higher to lower energy level} \\ \hline \text{D.} & \text{X-ray} & \text{IV.} & \text{due to rapid acceleration of electrons} \\ \hline \end{array}$$
Choose the correct answer from the options given below:
Answer: (C) A-IV, B-I, C-II, D-III
- Radio waves: produced by the rapid (oscillating) acceleration of electrons in antennas → IV
- Microwaves: produced by special vacuum tubes such as the magnetron → I
- Infrared: emitted by vibrations of atoms and molecules → II
- X-rays: emitted when inner-shell electrons drop from higher to lower levels (and by braking of fast electrons) → III
A-IV, B-I, C-II, D-III.
Solution by Sreeraj P, M.Sc Physics