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Old Dec 21st 2017, 06:54 AM   #11
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Is this the 5 minute argument, or the full half hour?

I wouldn't know where to link for a reference,
All I can say is that as a "hobby" physicist I have frequently noted the term "light" being used as a catch-all term for the entire EMR spectrum.
If you don't believe us, there is not a lot we can do about it.

All I can say is that there is nothing particularly special about that narrow band of the spectrum you insist is the only part that can be called light, except that it happens to be the part we can see.

As long as you are aware that when you come across the term "light" in a Physics context, it might refer to the wider spectrum. This could prevent you gaining the (erroneous) impression that light stands in any way separate from Radio, or micro-waves or X or gamma rays etc.
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Old Dec 23rd 2017, 07:09 PM   #12
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I just came across a very] interesting and relevant statement in the text Introduction to Elementary Particles by David Griffiths, WILEY-VCH press, page 14 where the footnote reads
* In this book the word light stands for electromagnetic radiation. whether or not it happens to fall in the visible region.

Last edited by Pmb; Jan 7th 2018 at 02:42 PM.
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