# I Stationary states (The Bohr hydrogen atom)

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1. Jun 13, 2017

### Erenjaeger

why are energies of the stationary states negative ??

2. Jun 13, 2017

### vanhees71

Because we choose the potential such that it vanishes at infinity. The absolute value of the energy is unobservable, you can add an arbitrary real value to the total energy without changing any physics.