Match List-I with List-II
| List-I | List-II |
| Electromagnetic wave | Production |
| (A) Light | (I) Klystron valve or magnetron valve |
| (B) X-rays | (II) Rapid acceleration and deceleration of electrons in aerials |
| (C) Microwave | (III) Electrons in atoms move from one energy level to a lower energy level |
| (D) Radiowave | (IV) inner shell electrons/ fast-moving electrons decelerated by a metal target |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
Each part of the electromagnetic spectrum is produced by a characteristic process.
(A) Light — this matches (III) Electrons in atoms move from one energy level to a lower energy level. Visible light is emitted when an atomic electron jumps down to a lower level and gives out the energy difference as a photon.
(B) X-rays — this matches (IV) inner shell electrons/ fast-moving electrons decelerated by a metal target. X-rays come from transitions of inner shell electrons, or from fast electrons slowing down in a metal target.
(C) Microwave — this matches (I) Klystron valve or magnetron valve. These special electron tubes generate microwaves.
(D) Radiowave — this matches (II) Rapid acceleration and deceleration of electrons in aerials. The oscillating charges in an aerial radiate radio waves.
NCERT (2026-27):
Gamma Rays – …
