I understand that there is such a thing as the electro magnetic spectrum, and that light and RF are both on it, so dose that mean that they are made of the same thing? Just at different frequencies.

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One thing I'd like to mention: although (as the answers have said) light and radio waves are both electromagnetic waves, it doesn't quite make sense to talk about what those waves are made of, just as it doesn't quite make sense to talk about what an ocean wave is made of. A wave is really just a moving pattern. –  David Z Sep 16 '11 at 0:45
But you wouldn't have an ocean wave if you didn't have H2O, right? –  Corey Sep 25 '11 at 15:35
You already answered it yourself, I cannot realize what is not clear for you. May be there is something deeper in the question? –  Anixx Feb 29 '12 at 10:07

More specifically, light is 400 to 800 Teraherz, RF is 3 Kiloherz to 300 Gigaherz.

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so those waves (light & RF) would be made of photons? –  Corey Sep 25 '11 at 15:34
Yes, though people don't usually talk of photons for RF, 'cause individual photon energies at that frequency are so small, its not so useful to describe RF waves in terms of photons, but one could do so. –  user1631 Sep 26 '11 at 16:58

Yes, they are both electromagnetic radiation whose waves are at different frequencies.

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