From: utzoo!decvax!duke!harpo!ihnp4!houxz!hocsb!hocsf!hocsd!jis Newsgroups: net.physics,net.ham-radio,net.followup Title: Re: faster than light Article-I.D.: hocsd.124 Posted: Fri Jan 14 14:46:06 1983 Received: Thu Jan 20 03:58:14 1983 Although the phase velocity of an elctromagnetic disturbance can be greater than the speed of light in dispersive media, it strikes me as improper or misleading to claim that an "electric signal" can travel faster than light. The concept of a signal is intimately related to communication, and a "electric signal" travelling at the phase velocity (whatever that might mean) cannot be used to relly send a "signal" (as is normally connoted by the word) to anyone at a velocity greater than that of light. Jishnu Mukerji ABI Holmdel 1B-425 {vax135, harpo, allegra}!hocsd!jis