Mar 30, 2014 #1 PsychonautQQ 784 10 I was wondering where the derivation of the formula Group Velocity = Phase Velocity + K(dVp/dK)
Mar 30, 2014 #2 UltrafastPED Science Advisor Gold Member 1,910 216 The derivation is shown here: http://en.wikipedia.org/wiki/Group_velocity#Other_expressions