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In a certain material electromagnetic waves propagate such that their angular frequency w and wave number k are related by w = wo a 9 ko where wo, ko and a are constants. Determine the requirement on a > 0 such that the group speed is greater than the phase speed in this material.

In a certain material electromagnetic waves propagate such that their angular frequency w and wave number k are related by w = wo a 9 ko where wo, ko and a are constants. Determine the requirement on a > 0 such that the group speed is greater than the phase speed in this material.

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In a certain material electromagnetic waves propagate such that their angular frequency w and wave number k are related by w = wo k (15) ko α where wo, ko and a are constants. Determine the requirement on a > 0 such that the group speed is greater than the phase speed in this material.
Transcribed Image Text:In a certain material electromagnetic waves propagate such that their angular frequency w and wave number k are related by w = wo k (15) ko α where wo, ko and a are constants. Determine the requirement on a > 0 such that the group speed is greater than the phase speed in this material.
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