# Hydrogen Atom

1. Nov 17, 2009

### Dinno

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

When a hydrogen atom undergoes a transition from the n=2 state to the n=1 level, a photon
with $$\lambda$$=122nm is emitted.

a)If the atom is modeled as an electron in a one-dimensional box, what is the width of the box in order for the n=2 to n=1 transition to correspond to emission of a photon of this energy?

2. Relevant equations

3. The attempt at a solution

Do not know what equations to use to solve this problem

2. Nov 17, 2009

### kuruman

What is the expression that gives the energies of a particle in a one-dimensional box? Start from there. Match the energy difference from n =2 to n = 1 to the energy of the 122 nm photon.