Match Electromagnetic waves listed in column I with Production method/device in column II.
| Column-I | Column-II |
| Electromagnetic waves | Production method/device |
| (A) Microwaves | (I) LC oscillator |
| (B) Infrared | (II) Magnetron |
| (C) X-rays | (III) Vibration of atoms/molecules |
| (D) Radio waves | (IV) Bombarding large atomic number metal target with fast moving electrons |
The correctly matched combination is as in option :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) - (II), (B) - (III), (C) - (IV), (D) - (I)
Each band of the electromagnetic spectrum is produced by a source whose natural frequency lies in that band.
(A) Microwaves — this matches (II) Magnetron. Microwaves are produced by special vacuum tubes such as klystrons, magnetrons and Gunn diodes.
(B) Infrared — this matches (III) Vibration of atoms/molecules. Hot bodies and molecules emit infrared from their vibrational motion.
(C) X-rays — this matches (IV) Bombarding large atomic number metal target with fast moving electrons. The sudden deceleration of the electrons in a heavy-metal target (an X-ray tube) produces X-rays.
(D) Radio waves — this matches (I) LC oscillator. Radio waves come from the accelerated motion of charges in oscillating circuits and antennas.
NCERT (2026-27):
Radio Waves – “Radio waves are produced by the accelerated motion of charges in conducting wires.”
Microwaves – “Microwaves (short-wavelength radio waves), with frequencies in the gigahertz (GHz) range, are produced by special vacuum tubes (called klystrons, magnetrons and Gunn diodes).”
Infrared Waves – “Infrared waves are produced by hot bodies and molecules.”
X-Rays – “… One common way to generate X-rays is to bombard a metal target by high energy electrons.”