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Sep 3, 2013 at 9:13 vote accept Spaceman Spiff
Sep 3, 2013 at 9:13
Nov 22, 2012 at 19:59 history edited Qmechanic CC BY-SA 3.0
added links; layout;
Nov 22, 2012 at 17:57 answer added Mark Mitchison timeline score: 12
Nov 22, 2012 at 17:28 comment added Spaceman Spiff I was thinking in terms of vacuum. I would also like to know the distinction in a medium.
Nov 22, 2012 at 17:03 comment added Emilio Pisanty Are you thinking of electromagnetic waves propagating in vacuum or in a medium? With respect to the group/phase velocity distinction, the two cases are very, very different.
Nov 22, 2012 at 16:10 history asked Spaceman Spiff CC BY-SA 3.0