Match List - I with List - II.
| List – I | List – II | ||
|---|---|---|---|
| (A) | X-rays | (I) | Excitation of Atom |
| (B) | UV rays | (II) | Oscillating current |
| (C) | \( \gamma \)-rays | (III) | Sudden retardation of high energy electron |
| (D) | Radiowaves | (IV) | Nuclear origin |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Each part of the electromagnetic spectrum has its own usual source.
(A) X-rays — this matches (III) Sudden retardation of high energy electron. X-rays are produced when fast electrons are suddenly stopped by a metal target.
(B) UV rays — this matches (I) Excitation of Atom. Atoms and molecules excited by high temperature or discharge emit ultraviolet radiation.
(C) γ-rays — this matches (IV) Nuclear origin. They are emitted by radioactive nuclei in transitions between nuclear energy levels.
(D) Radiowaves — this matches (II) Oscillating current. They are produced by accelerated charges oscillating in conducting wires and circuits.
NCERT (2026-27):
X-Rays – “… One common way to generate X-rays is to bombard a metal target by high energy electrons.”
Different Types of Electromagnetic Waves – “… Table 8.1 … Ultraviolet … Inner shell electrons in atoms moving from one energy level to a lower level”
Gamma Rays – “… This high frequency radiation is produced in nuclear reactions and also emitted by radioactive nuclei.”
Radio Waves – “Radio waves are produced by the accelerated motion of charges in conducting wires.”