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Given a wave with the dispersion relation w ck m for k 0 and m...

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Given a wave with the dispersion relation w ck m for k 0 and m 0 which one of the following is true a The group velocity is greater than the phase velocity b The group velocity is less than the phase velocity c The group velocity and the phase velocity are equal d There is no definite relation between the groun velocity and the pho

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