# The electron from a hydrogen atom drops from an excited state into the ground state.?

Part A

How much energy does the electron have initially in the n=4 excited state?

Express your answer with the appropriate units.

### 1 Answer

Relevance

- Steve4PhysicsLv 710 months agoFavorite Answer
The n-th energy level is Eₙ = 13.6/n² (in units of electron-volts), eV)

So the 4-th level has energy E₄ = -13.6/4² = 0.85 eV

‘suitable units’ could also mean joules, in which case:

E₄ = 0.85 * 1.6*10^-19 = -1.36*10^-19 J

Note, the image in the question is irrelevant. Maybe it’s something to do with Part B which you haven’t included?

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