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## Homework Statement

There is a Ar cube crystal with Lenard jones potential:

**V[itex]^{L.J.}[/itex]=-[itex]\alpha[/itex]/r[itex]^{6}[/itex]+[itex]\beta[/itex]/r[itex]^{12}[/itex]**

We know the volume V, the parameters of the L.J. potential, and the mass of the Ar atom (m[itex]_{Ar}[/itex]).

Determine the phonon density of state. (

**D(ω)**=?)

## Homework Equations

**D(ω)=Ʃδ(ω-ω[itex]_{i}[/itex])**

## The Attempt at a Solution

I have no idea what to do with the given lenard jones potential, and its parameters. How should I calculate the dispersion relation?