1. The problem statement, all variables and given/known data
this is a problem that puzzles me. it goes like this:
energy/10?18 J
ionisation level 0.0
level D
level C
level B
ground state A
? 4.6
An electron with kinetic energy 2.6 10?18 J collides inelastically with an electron
in the ground state.
State which energy levels may be occupied following this collision.
A photon of energy 2.6 10?18 J is incident on an electron in the ground state.
State and explain what would happen.

2. Relevant equations
e= h1 - h2

3. The attempt at a solution
i looked at the kinetic energy needed to escape the ground state. if i calculate 4.6-2.6, i get 2j of kinetic energy. the electron cant get to level d. will b to c be correct?
for the second part, i am speculating the kinteic energy will have no effect at the ground level. but i am not totally sure. can someone please explain.
please comment.