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Introductory Physics Homework Help
How to show speed is equal to group velocity?
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[QUOTE="RPinPA, post: 6061996, member: 651116"] The speed v is the speed that occurs in the relativistic factor ##\gamma = 1/\sqrt {1 - (v^2/c^2)}##. And momentum depends on velocity, ##p = \gamma mv##. So it looks like you need to solve for the momentum, and from that solve for the velocity. Edit: I realized on thinking about this that it would be even easier to simply use the fact that ##E = \gamma mc^2## and solve for ##\gamma## and [I]v[/I] that way. [/QUOTE]
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Introductory Physics Homework Help
How to show speed is equal to group velocity?
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