Here's why:
* Electromagnetic radiation is a type of energy that travels in the form of waves.
* These waves are made up of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of wave propagation.
* The speed of these waves in a vacuum depends solely on the permittivity and permeability of free space, which are fundamental constants.
* This means that the frequency and wavelength of the electromagnetic radiation do not affect its speed in a vacuum.
Therefore, gamma rays, X-rays, ultraviolet light, visible light, infrared radiation, microwaves, and radio waves all travel at the same speed in a vacuum.
