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$\begingroup$ Might be good to add that what makes visible light different is not that it has photons, but that our eyes absorb only photons with those ranges. Visible light isn't visible because of anything objective about the photon, it's visible because of our eyes. $\endgroup$
– Mooing Duck
Commented Jul 13, 2014 at 17:48
3

$\begingroup$ Expanding on that, it's important to understand that the division of the whole electromagnetic spectrum is entirely subjective: there is not a "hard" limit between, say, gamma rays and X-rays. It's merely a rough way to categorize radiation of different wavelengths according to its properties and uses. $\endgroup$
– andrepd
Commented Jul 13, 2014 at 19:55
$\begingroup$ actually, the denomation come from the way we can observe it. And before Maxwell work, we didn't know that all the EM spectra was just EM waves $\endgroup$
– sailx
Commented Jul 13, 2014 at 20:44

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