Dispersion Relation

1. Oct 30, 2008

yellowgold

What is the dispersion relation in photons? "(Frequency momentum or etc)

2. Oct 31, 2008

clem

A dispersion relation is the relation between the frequency omega and the wave number k.

3. Oct 31, 2008

lightarrow

Or, said in another way, how the phase speed of light (and hence, the index of refraction) depends on the light's frequency in that specific material/medium.

4. Oct 31, 2008

malawi_glenn

lightarrow, why restrict yourself to light? The dispersion relation are for waves, all waves, as far as I have understood it.

5. Oct 31, 2008

6. Nov 1, 2008

malawi_glenn

haha yeah now I saw he did! ;-)
Though he asked what dispersion relation was "in general"

7. Nov 1, 2008

Avodyne

The dispersion relation for photons is
$$\omega=|\vec k|c.$$

8. Nov 1, 2008

yellowgold

Thank you very much everybody. I understood it.