[SOLVED] EM waves I have always been uncertain about what an EM wave consists of. I used to think it was a photon and somehow it carried properties of a wave. From reading some of the other posts on this forum, I'm realizing that I probably far off. So what is it? Does it have mass? Electro-magnetic... I'd assume it has something to do with electrons, does it and how so? Straighten me out people!