Arrange the given electromagnetic waves in descending order of their wavelengths.
A. X-rays
B. Microwaves
C. Radio waves
D. Gamma-rays
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → C, B, A, D
The electromagnetic spectrum in order of decreasing wavelength is radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays.
\( \text{Radio waves (C): longer than about } 0.1\,\mathrm{m} \)
\( \text{Microwaves (B): about } 0.1\,\mathrm{m} \text{ to } 1\,\mathrm{mm} \)
\( \text{X-rays (A): about } 10\,\mathrm{nm} \text{ to } 10^{-4}\,\mathrm{nm} \)
\( \text{Gamma-rays (D): shorter than about } 10^{-3}\,\mathrm{nm} \)
So the descending order of wavelength is C, B, A, D.
Note: A similar question was also asked in CUET (UG) 2026 on 18-05-2026 (Slot 2).
NCERT (2026-27):
Gamma Rays – …
