The relation for total energy (E ) and momentum (p) for a relativistic particle is E 2 = c2 p2 + m2c4, where m is the rest mass and c is the velocity of light. Using the relativistic relations E = ω and p = k, where ω is the angular frequency and k is the wave number, show that the product of group velocity (vg) and the phase velocity (vp) is equal to c2, that is vpvg = c2

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The relation for total energy (E ) and momentum (p) for a relativistic particle
is E 2 = c2 p2 + m2c4, where m is the rest mass and c is the velocity of light.
Using the relativistic relations E = ω and p = k, where ω is the angular
frequency and k is the wave number, show that the product of group velocity
(vg) and the phase velocity (vp) is equal to c2, that is vpvg = c2

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