# Weird Al Yankovic's Partial Differential Equation

In Weird Al Yankovic's music video "White and Nerdy" (1:20-1:36), there are flashes of a partial differential equation:

$$\left(-\frac{h^2}{2\mu}\nabla^2 - \frac{e^2}{r}\right)\psi(r)=E\psi(r)$$

Does anyone know what the name of this equation is?

• Well the Schrödinger equation is a linear PDE so it always reduces to an eigenvalue problem. The fact that the equation has countably many solutions (eigenfunctions) so long as the electron is bounded to the proton in turn corresponds intuitively to the concept of quantization of energy $E$ and other physical properties. – Squid Mar 20 '14 at 22:57
It's Schroedinger's equation for the Hydrogen atom with units chosen so that $4 \pi \epsilon_0 = 1$. See "Hydrogen atom" at the English Wikipedia's article on the Schrodinger Equation.
• Interesting. Does the expression $4\pi\epsilon_0=1$ mean anything, physically? – Paul Mar 20 '14 at 23:16
• In the Coulomb force law, the constant is $k = \frac{1}{4 \pi \epsilon_0}$, where $\epsilon_0$ is the permittivity of free space. See en.wikipedia.org/wiki/Coulomb%27s_law#Coulomb.27s_constant and its referents. – Eric Towers Mar 20 '14 at 23:19