- Both K.E and P.E increase
- Both K.E and P.E decrease
**P.E increases, K.E decreases**- K.E increases, P.E decreases

## Answer:

When a **hydrogen atom** is raised from the ground state to an excited state: **P.E increases, K.E decreases**

### Helping Concept:

- Kinetic energy =
**ke**^{2}/2r - As r increases kinetic energy decreases and tends to zero for higher orbits.
- Potential energy =
**-ke**^{2}/r - Potential energy increases as r increases because P.E is less negative as we move from lower orbit to higher orbit. (less negative mean P.E increases)

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