Wave Equation

$\frac{{\partial }^2\Psi }{\partial t^2}=c^2\Delta \Psi$

• $\Psi (\vec{r},t)$ is the wave function. Any function that satisfies the above 2nd Order DEQ behaves like a wave
  • Eigenfunctions are sin, cos, or complex exponentials
• $c$ is the speed of the wave
• $\Delta$ is the Laplacian