Arrange the following electromagnetic waves in increasing order of their wavelengths.
A. X-rays
B. Radio waves
C. Microwaves
D. \( \gamma \)-rays
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → D, A, C, B
In the electromagnetic spectrum the wavelength increases from gamma rays to radio waves (and the frequency decreases).
\( \gamma\text{-rays: } \lambda \lt 10^{-12}\,\mathrm{m} \text{ (roughly)} \)
\( \text{X-rays: } 10^{-12}\text{ to }10^{-8}\,\mathrm{m} \)
\( \text{Microwaves: } 10^{-3}\text{ to }10^{-1}\,\mathrm{m} \)
\( \text{Radio waves: } \lambda \gt 0.1\,\mathrm{m} \)
Increasing order of wavelength: \( \gamma \)-rays (D) < X-rays (A) < microwaves (C) < radio waves (B), i.e. D, A, C, B.
Note: A similar question was also asked in CUET (UG) 2025 on 03-06-2025 (Slot 2).
NCERT (2026-27):
Gamma Rays – …
