Arrange the following EM waves in increasing order of their frequency ?
A. Ultraviolet rays
B. Gamma rays
C. Radio waves
D. Infrared waves
E. X-rays
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → \( C \lt D \lt A \lt E \lt B \)
In the electromagnetic spectrum the frequency rises as the wavelength falls: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays, in that order of increasing frequency.
\( \text{C. Radio waves: about } 10^{5}\text{ to }10^{9}\,\mathrm{Hz} \)
\( \text{D. Infrared waves: about } 10^{12}\text{ to }4\times10^{14}\,\mathrm{Hz} \)
\( \text{A. Ultraviolet rays: about } 10^{15}\text{ to }10^{17}\,\mathrm{Hz} \)
\( \text{E. X-rays: about } 10^{17}\text{ to }10^{19}\,\mathrm{Hz} \)
\( \text{B. Gamma rays: above about } 10^{19}\,\mathrm{Hz} \)
So the increasing order of frequency is C, D, A, E, B.
NCERT (2026-27):
Gamma Rays – …
