JEE Main 2023 · 1 February · morning · Single correct · +4 / −1
Match List I with List II :
Choose the correct answer from the options given below :
| List I | List II | ||
|---|---|---|---|
| A. | Microwaves | I. | Radio active decay of the nucleus |
| B. | Gamma rays | II. | Rapid acceleration and deceleration of electron in aerials |
| C. | Radio waves | III. | Inner shell electrons |
| D. | X-rays | IV. | Klystron valve |
- (a) A-I, B-III, C-IV, D-II
- (b) A-IV, B-III, C-II, D-I
- (c) A-IV, B-I, C-II, D-III
- (d) A-I, B-II, C-III, D-IV
Answer and solution
Answer (c) A-IV, B-I, C-II, D-III
Solution
Physics sir · 3 steps
Ask what each wave is born from: an oscillator, an aerial, an atom's inner shell, or the nucleus.
- Match by source. Each band of the spectrum comes from a different source. Higher frequency usually means a source deeper inside matter, from circuits to atoms to the nucleus.
Wave How it is produced Match A. Microwaves Special vacuum tubes such as the klystron, magnetron and Gunn diode IV B. Gamma rays Radioactive decay of the nucleus I C. Radio waves Rapid acceleration and deceleration of electrons in aerials II D. X-rays Transitions of inner shell electrons, or fast electrons striking a metal target III - Gamma versus X-rays. Both are very energetic, so they are easy to swap. Gamma rays come from the nucleus. X-rays come from the electrons of the atom, in particular its inner shells.
- So. The matching is A-IV, B-I, C-II, D-III, which is option (c).
The idea to keep. Learn the spectrum as a ladder of sources: radio from aerials, microwaves from klystrons and magnetrons, X-rays from inner shell electrons, gamma rays from the nucleus.
Answer from the NTA final answer key. Solution by PrepWiser.