Posted by Andy on Wednesday, November 9, 2011 at 11:17pm.
what is your thinking?
<< The only type of electromagnetic radiation that is actually considered light is visible light. >>
It depends upon whom you are talking to. The eye can see a bit below 400 nm and a bit above 700 nm, but with rapidly decreasing sensitivity. The fact that "light" is a one-syllable word and "electromagnetic radiation" has ten syllables makes "light" a convenient substitute for other wavelength regions in casual conversation or when talking about the "speed of light".
All electromagnetic wavelengths travel at the speed of light only in a vacuum.
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