Quote:
Originally Posted by circumpolar
I found this responce to a similar question at physlink.com
http://www.physlink.com/Education/AskExperts/ae27.cfm
"All electromagnetic radiation, of which radio waves and X-rays are examples, travels at the speed c in a vacuum. The only difference between the two is that the frequency of X-rays is very much higher than radio waves.
If, on the other hand, the radio waves or X-rays are propagating through a medium other than the vacuum, their speed will generally be less than c and will depend upon the specific properties of the medium. Thus, in principle, neither can be said definitely to travel faster than the other if the medium is other than the vacuum."
Warren Davis, Ph.D., President, Davis Associates, Inc., Newton, MA USA
So nether can be said to travel faster then the other in a medium.
I think the last sentence supports me. 
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But we do know the properties of the medium and how photons of different wavelengths react in that medium.
Regards
Steven