Spectral lines and energy levels

1. The problem statement, all variables and given/known data
In the spectrum depicted bellow (see added picture) are spectral lines which resulted from emissions of a photon due to an electron decaying from a higher to a lower orbital in a Hydrogen-like atom (meaning- only one electron. No details about the nucleus)
All lines in the given spectrum are a result of an electron decaying for an excited state to the first excited state. The wavelength of line C is 48.214nm, Calculate the energy of a photon co-responding to line D.

2. Relevant equations

v=c/f
E(ph)= hv
Reidberg’s equation (too complicated to type in)

3. The attempt at a solution

Our presentation didn’t include any similar example, so i’m at a loss about how to approach this. Been staring at the page for a better part of the day.
Any help would be much appreciated

Attached Images
File Type: jpg spectrum.jpg (14.8 KB)

http://ift.tt/1hCxuQ2

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