| 1. | Besides, it's useful for defining the group velocity in a compact way.
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| 2. | The group velocity also turns out to be the energy transport velocity.
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| 3. | This means that phase-and group velocity of the waves are frequency dependent.
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| 4. | In the general case, the phase and group velocities may have different directions.
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| 5. | Slow light refers to a very low group velocity of light.
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| 6. | Also to the group velocity in a crystal, v _ g
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| 7. | In this case, the phase velocity is twice the group velocity.
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| 8. | The group velocity is positive, while the phase velocity is negative.
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| 9. | Showing that the envelope moves with the group velocity and retains its shape.
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| 10. | The variation of group velocity creates the mode partition noise.
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