All electromagnetic waves travel at the speed of light, which is approximately 299,792,458 meters per second (m/s) in a vacuum. This is often rounded to 3 x 10⁸ m/s.

While this is a constant speed, it can be slightly affected by the medium the wave is traveling through. For example, light travels slower through water or glass than it does through a vacuum.

Here's a key point:

* The speed of light is a fundamental constant in physics. It's not just the speed of visible light, but the speed of all electromagnetic radiation, including radio waves, microwaves, infrared radiation, ultraviolet radiation, X-rays, and gamma rays.