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Originally Posted by JJRousseau
Visible electromagnetic radiation, to be exact. But radiation is just movement (to or from a point - or in this case, a source) so in one sense, light IS movement.  |
The word 'radiation' has more than one meaning. It can indicate the act of moving outward from a source, or it refers to a class of physical objects which includes light. It doesn't mean anything to say that light IS movement.
Saying light is radiation is correct, but it's is a label, not an explanation. Saying that light is specifically electromagnetic radiation gets you a lot more, but only if you know electromagnetism. Otherwise, it's just more jargon.