Talk:Front velocity
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I believe this is the same as group velocity. Should we redirect? -- Pgabolde 20:25, 1 September 2005 (UTC)[reply]
No, all three are different. Signal velocity is usually defined as the velocity measured from when a pulse reaches half its maximum intensity. Clearly this is not the same as front velocity (which can also be defined as the speed at which a sudden change in intensity travels). These distinctions were thrashed out by Sommerfeld and Brillouin a long time ago. --Tdent 12:11, 4 October 2005 (UTC)[reply]