# Answer 6

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The dispersion curve indicates the relation between the energy and momentum of an oscillation quantum, e.g. a photon, a plasmon or a phonon.

• light $ωk=k⋅c0⋅1ε1$
• Surface plasmons $ωk=k⋅c0⋅1ε1+1ε2$

The slope of the dispersion curve is equal to the speed of propagation of the vibration.