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Thread: Question about quantum mechanics!

  1. #1 Question about quantum mechanics! 
    Forum Freshman
    Join Date
    Feb 2013
    I am confused about group velocity, phase velocity, and signal velocity of waves. Which of these would be the velocity of the corresponding particle to that wave? And, what's the difference between signal and group velocity? Is there a difference?

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  3. #2  
    Forum Professor river_rat's Avatar
    Join Date
    Jun 2006
    South Africa
    Group velocity = velocity that the wave packet moves through the medium in question.
    Phase velocity = velocity that a single market node or anti-node moves through the medium in question.
    Signal velocity = velocity at which information carried by the carrier wave propagates through medium. This is usually equal to the group velocity, if the medium is linear for example.

    In relativity, signal velocity is bound by the speed of light - the other two arent.

    As is often the case with technical subjects we are presented with an unfortunate choice: an explanation that is accurate but incomprehensible, or comprehensible but wrong.
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