My science teacher used to say a lot of weird stuff, but I'm just making sure on this one.


No. Radio waves ARE light, and so they travel at the speed of light.

Possible exception:

The speed of light $c$ that is always talked about as the "speed limit of the Universe" is the speed of light in vacuum. Light travels slower in a medium, and how much slower can be dependent on the wavelength of the light. So, in the right medium, radio waves could travel faster than optical waves, but I wouldn't call this "faster than light"; that would be very misleading...

  • $\begingroup$ Glad to help :) If you feel the answer is a satisfactory answer to your question, please accept it. $\endgroup$ – Kyle Oman Jun 21 '13 at 18:50
  • $\begingroup$ My science teacher said that her husband was a physics professor...sooooooooooooooooo... $\endgroup$ – Joe Pigott Jun 24 '13 at 16:21
  • 1
    $\begingroup$ In that case, your science teacher probably hasn't understood her husband's explanations. @Kyle 's explanation is right. $\endgroup$ – Thriveth Jun 26 '13 at 22:47


Radio waves are a form of electromagnetic radiation and so, by definition they travel at the speed of light (in a vacuum).

Have a look at the Wiki article on EM radiation, and more specifically, Radio Waves


Not the answer you're looking for? Browse other questions tagged or ask your own question.