|Dec20-05, 06:06 PM||#1|
Phase velocity, Group velocity
Would someone be kind enough to please give physical meanings to these two terms? I have never fully understood their meaning and difference (although I know how to express them mathematically).
If, say, I have a Gaussian-shaped signal in the frequency domain that I am sending through a medium (such as a crystal) in the direction z say and I want to specify where the maximum intensity is as a function of t (it is at z=0 when t=0), am I right in saying that I would use:
t= z/(group velocity)
where the group velocity is obviously evaluated at the frequency of largest intensity.
Any help on this fairly basic matter would be much appreciated.
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|Dec21-05, 08:42 AM||#2|
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This discussion might help: http://www.physicsforums.com/showthread.php?t=96835
|Dec21-05, 04:31 PM||#3|
Thank you, I shall have a look but I actually think that I have a good enough understanding now having read a few relevant sections in the Feynman Lectures (sorry, this is what I should have done first).
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