Arrange the following radiations of e.m. waves in increasing order of…

The correct answer is Option (1) → (A), (B), (C), (D)

In the electromagnetic spectrum, wavelength increases from gamma rays through X-rays, ultraviolet, visible and infrared to microwaves and radio waves. Typical ranges:

    \( \text{X-rays: } 10^{-12}\ \text{to}\ 10^{-8}\,\mathrm{m} \)
    \( \text{Ultraviolet: } 4\times10^{-7}\ \text{to}\ 10^{-9}\,\mathrm{m} \)
    \( \text{Infrared: } 10^{-3}\ \text{to}\ 7\times10^{-7}\,\mathrm{m} \)
    \( \text{Microwaves: } 0.1\ \text{to}\ 10^{-3}\,\mathrm{m} \)

So the increasing order of wavelength is X-rays, ultraviolet, infrared, microwaves: (A), (B), (C), (D).

NCERT (2026-27):
Electromagnetic Spectrum – “… We now know that, electromagnetic waves include visible light waves, X-rays, gamma rays, radio waves, microwaves, ultraviolet and infrared waves. The classification of em waves according to frequency is the electromagnetic spectrum (Fig. 8.4). … We briefly describe these different types of electromagnetic waves, in order of decreasing wavelengths.”