Wave packets has a group velocity of(adsbygoogle = window.adsbygoogle || []).push({});

[tex]v_{group}=\frac{d\omega}{dk}[/tex]

and its phase velocity is

[tex]v_{phase}=\frac{\omega}{k}[/tex]

Show that the group velocity and the phase velocity are related by:

[tex]v_{group} = v_{phase} - \lambda\frac{dv_{phase}}{d\lambda}[/tex]

Can someone please tell me where to start on this problem?

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# Velocity of Wave Packets

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