A wave packet describes a particle having momentum p. Starting with the relativistic relationship E2 = p2 c2 + E20, show that the group velocity is c and the phase velocity is c/β (where β = v/c). How can the phase velocity physically be greater than c ?

A wave packet describes a particle having momentum p. Starting with the relativistic relationship E2 = p2 c2 + E20, show that the group velocity is c and the phase velocity is c/β (where β = v/c). How can the phase velocity physically be greater than c ?

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Question

A wave packet describes a particle having momentum p. Starting with the relativistic relationship E² = p² c² + E²₀, show that the group velocity is c and the phase velocity is c/β (where β = v/c). How can the phase velocity physically be greater than c ?

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