Excited state?

1. Apr 15, 2009

fball558

Excited state??

1. The problem statement, all variables and given/known data

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??

2. Apr 15, 2009

RoryP

Re: Excited state??

well the 13.6 represents the ionisation energy for hydrogen, and n represents the orbital number =]

3. Apr 15, 2009

fball558

Re: Excited state??

yeah i got that part, but where does the 10.6 eV come into play?
in the equation the only unknown you could possibly solve for is the n or E. but ground state meand n = 1 right so E would just be -13.6

4. Apr 15, 2009

RoryP

Re: Excited state??

Nooo the 13.6 is the total amount of energy you would need to excite an electron from ground state to leaving the atom completely!! Hence ionization energy :)