- #1

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## Homework Statement

Show for a simple square lattice that the kinetic energy of a free electron is higher at the corner of the first zone than at the midpoint a side face by a factor of 2.

## Homework Equations

Simple geometry.

## The Attempt at a Solution

I think I know how to solve, but I am not completely sure I understand the question. The position of the electron refers to the position of its k-vector in k-space right? Well this is not real space, and I cant really see how this has anything to do with the lattice being square in real space.