Arrange the following in the decreasing order of their wavelengths.
(A) microwaves
(B) ultraviolet rays
(C) infrared rays
(D) gamma rays
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A), (C), (B), (D)
In the electromagnetic spectrum the wavelength decreases, and the frequency and photon energy increase, in the order radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays.
Of the four given, microwaves lie closest to the radio end and so have the longest wavelength, followed by infrared, then ultraviolet, and gamma rays have the shortest. The decreasing order of wavelength is therefore (A) microwaves, (C) infrared rays, (B) ultraviolet rays, (D) gamma rays.
NCERT (2026-27):
Gamma Rays – …
