Arrange the following electromagnetic waves in increasing order of th…

The correct answer is Option (3) → (C), (A), (D), (B)

In the electromagnetic spectrum the wavelength grows from the gamma and X-ray end to the radio end.

(C) X rays: about \( 10^{-10} \) to \( 10^{-8}\,\mathrm{m} \)
(A) Visible Light: about \( 4\times10^{-7} \) to \( 7\times10^{-7}\,\mathrm{m} \)
(D) Infra-red rays: about \( 10^{-6} \) to \( 10^{-3}\,\mathrm{m} \)
(B) Microwave: about \( 10^{-3} \) to \( 1\,\mathrm{m} \)

So the increasing order of wavelength is X rays, visible light, infra-red, microwave, that is (C), (A), (D), (B).

NCERT (2026-27):
Summary – “… The spectrum of electromagnetic waves stretches, in principle, over an infinite range of wavelengths. Different regions are known by different names; γ-rays, X-rays, ultraviolet rays, visible rays, infrared rays, microwaves and radio waves in order of increasing wavelength from 10^-2 Å or 10^-12 m to 10⁶ m.”