The general form of this equation is typically:
$\psi_n(x) = \sqrt{\frac{2}{L}} \sin(\frac{n\pi x}{L})$
where:
* $\psi_n(x)$ is the wave function for the $n$-th energy level.
* $L$ is the length of the box.
* $n$ is the quantum number ($n = 1, 2, 3, ...$).
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