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**Excited state??**

## Homework Statement

Initially a hydrogen atom is in its ground stat. An electron with kinetic energy 10.6 eV collides with the atom and excites it. What is the remaining kinetic energy of the electron?

A. 13.6

B. 23.9

C. 3.0

D. .4

E. .6

the answer is .6 eV but not sure how they got this.

im reviewing for an exam so any help would be great.

i was thinking this has something to do with the equation

E = (-13.6 eV)/(n^2)

but dont know how to use this in this case??