Answer to Question #272445 in Physics for Cheppie

Question

Given that the potential energy of a pair of atoms in a solid is raised by 1 eV when their

separation is changed by 1Å, calculate the macroscopic elastic modulus of the lattice.

Answer 1

The elastic modulus is

$$k=\frac{2E}{x^2}=2\text{ eV/Å}^2.$$