# Atomic structure problem

1. May 14, 2014

### Sumanth

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

Three photons coming from excited atomic hydrogen sample are picked up. Their energies are 12.1 eV, 10.2 eV and 1.9 eV. These photons must come from???
A)two or three atoms
B)single atom
C)three atoms
D)two atoms

3. The attempt at a solution
By solving it i got single atom but it is not the answer...

Last edited: May 14, 2014
2. May 14, 2014

### Simon Bridge

3. May 14, 2014

### Sumanth

In a hydrogen atom energy of k level is -13.6eV
L level is -3.4eV
M level is -1.5eV
Now if electrons dexcite from M level then there is possibility for the three values of the energy of photons released... That's the reason I got only single atom

4. May 14, 2014

### Staff: Mentor

How many electrons are there in each atom?

5. May 14, 2014

### Sumanth

One. Electron in each atom .... So. I think answer will be three ........ I didnt think of the number of electrons but i thought of only possibilities

6. May 14, 2014

### Simon Bridge

Is it possible for one electron to make two of the transitions in a row?