How fast do light waves travel?
Light in a vacuum is represented by a constant known as c=2.99792458 m/s. Otherwise I can recommend two books called general relativity and special relativity both written by our very own Albert Einstein.
They travel at the speed of light. Radio waves are a form of light, but a much lower frequency than we can see with our eyes. Also Einstiens theory states that nothing can travel the speed of light however all waves travel the same speed making radio waves travel the speed of light. Hope this helps from scottadroid :D