Match the LIST-I with LIST-II
| LIST-I (Electromagnetic Waves) | LIST-II (Characteristics) |
| A. Radio waves | I. frequencies in GHz range |
| B. Microwaves | II. wavelength range 400-700 nm |
| C. Infrared waves | III. produced by accelerated motion of charges in conducting wires |
| D. Visible rays | IV. produced by hot bodies and molecules |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-III, B-I, C-IV, D-II
The bands of the electromagnetic spectrum differ in frequency and wavelength, and each band is produced by a different kind of source.
(A) Radio waves — this matches (III) produced by accelerated motion of charges in conducting wires. Oscillating currents in antennas radiate radio waves.
(B) Microwaves — this matches (I) frequencies in GHz range. Microwaves (used in radar and microwave ovens) have frequencies of about 1 GHz to 300 GHz.
(C) Infrared waves — this matches (IV) produced by hot bodies and molecules. Vibrating molecules of warm objects emit infrared, which is why it is called heat radiation.
(D) Visible rays — this matches (II) wavelength range 400-700 nm. This is the narrow band the human eye can detect, from violet (400 nm) to red (700 nm).
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.”
Visible Rays – “… It runs from about 4 × 1014 Hz to about 7 × 1014 Hz or a wavelength range of about 700 – 400 nm.”