I know that for a dispersive wave packet, the group velocity equals the phase velocity, which is given by v=w/k. But how do I calculate the group velocity of a non-dispersive wave packet? I'm supposed to be giving an example with any functional form.
group velocity is defined by (partial derivative of w(k))/(partial derivative of k)
The Attempt at a Solution
Since w is not dependent on k, the partial derivative should equal to zero? But I'm not sure how to go from there.