This speed, known as the speed of light, is approximately 299,792,458 meters per second.
Here's why:
* Electromagnetic waves are disturbances in the electromagnetic field. This field is made up of electric and magnetic fields that are intertwined and constantly interacting.
* The speed of light is determined by the fundamental properties of the electromagnetic field. These properties are the same everywhere in a vacuum.
* When electromagnetic waves travel through a medium, their speed is affected. This is because they interact with the atoms and molecules in the medium, slowing them down.
Therefore, the only environment where all frequencies travel at the same speed is a vacuum.
