# How can I show that the bulk modulus is about r^-4?

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1. Mar 5, 2017

### joemmonster

1. The problem statement, all variables and given/known data
Using the equations, show the bulk modulus is about r^-4.

2. Relevant equations

3. The attempt at a solution

Tried to plug Uij but it is not same as U. To be honest, I don't know where to start.

2. Mar 9, 2017

### Mapes

What values were you given for $m$ and $n$? If you weren't given values, what pair potential have you discussed in class?

What's the relationship between $r$ and $\Omega$?