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\section{Theory}  The wave equation is given as \[\nabla^2p-\frac{1}{c^2}\frac{\partial^2\rho}{\partial^2t}=0\] where $p$ is the pressure, $\rho$ is the density, and $c^2=\frac{\partial{p}}{\partial{\rho}\Big|_S}}$ $c^2=\frac{\partial{p}}{\partial{\rho}\|_S}}$