The electromagnetic wave having the shortest wavelength is

The correct answer is Option (2) → γ-rays

In order of increasing wavelength, the spectrum runs through γ-rays, X-rays, ultraviolet, visible, infrared, microwaves and radio waves. So γ-rays have the shortest wavelength of the four.

NCERT (2026-27):
Summary – “… 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^–12m to 10⁶m.”