What is the velocity of a radio wave traveling through free space?

Radio waves are a form of electromagnetic radiation, residing on the exact same spectrum as visible light, microwaves, and X-rays. Because of this, radio waves travel at the exact same speed as light when moving through a vacuum or free space, which is approximately 300,000,000 meters per second. Distractors mentioning the speed of sound are incorrect; sound is a mechanical wave requiring a physical medium, traveling vastly slower than radio waves. Furthermore, while signals inside a physical coaxial cable might travel at a fraction of the speed of light, radio waves in free space do not experience this slowdown.