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For a perfect free electron gas in a metal, the magnitudes of phase velocity (v) and group velocity (v.) are such that Vp =Vg

For a perfect free electron gas in a metal, the magnitudes of phase velocity (v) and group velocity (v.) are such that Vp =Vg H Vp = 1/21/8 vp = 2vg Ovp = 2vg P

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