Chemistry
posted by Ashley on .
A line in the Lyman series of the hydrogen atom emission results from the transition of an
electron from the n=3 level to the ground state level.
a) What n level (#) is the ground state level for the hydrogen atom?
b) What is the energy of this photon in Joules?

a) one
b) look it up 
c) What is the frequency (in Hz) and wavelength (in nm) of the emitted photon?

I don't understand this problem at all, I'm very confused, help would be greatly appreciated