X-Nico

unusual facts about Reduced mass

Effective mass

Reduced mass, used to simplify a two-body problem in terms of a one-body problem.

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see also

Complete set of commuting observables

Also, the Hamiltonian \hat{H} = -\frac{\hbar^2}{2\mu}\nabla^2 - \frac{Ze^2}{r} is a function of r only and has rotational invariance, where \mu is the reduced mass of the system.