PsychonautQQ
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I was wondering where the derivation of the formula
Group Velocity = Phase Velocity + K(dVp/dK)
Group Velocity = Phase Velocity + K(dVp/dK)
Where can I find the derivation of the Group Velocity formula?
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Science Advisor
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The derivation is shown here: http://en.wikipedia.org/wiki/Group_velocity#Other_expressions
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