Arrange the following electromagnetic waves in the increasing order of their wavelengths:
(A) Radio waves
(B) Infrared waves
(C) Gamma rays
(D) Microwaves
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (C), (B), (D), (A)
Across the electromagnetic spectrum, wavelength increases in the order gamma rays, X-rays, ultraviolet, visible, infrared, microwaves, radio waves. Typical wavelengths:
\( \text{(C) gamma rays: below } 10^{-12}\,\mathrm{m} \)
\( \text{(B) infrared: about } 10^{-6} \text{ to } 10^{-3}\,\mathrm{m} \)
\( \text{(D) microwaves: about } 10^{-3} \text{ to } 0.1\,\mathrm{m} \)
\( \text{(A) radio waves: above } 0.1\,\mathrm{m} \)
So the increasing order is (C), (B), (D), (A).
NCERT (2026-27):
Gamma Rays – …
