Posted by Morgan on Sunday, March 25, 2012 at 11:54pm.
If a more complicated atom has two energy levels for its electrons at (15) eV and (30.1) eV, what is the wavelength of the photon (in nm) that is emitted when an electron transitions between these two levels?

physics  drwls, Monday, March 26, 2012 at 1:55am
The energy difference between levels is 15.1 eV. Convert that to Ephoton, in Joules.
Ephoton = 2.42*10^18 J
Set that equal to h*c/(wavelength) and solve for the wavelength.
h is Planck's constant.
c is the speed of light
The photon will be in the very far "vacuum" ultraviolet.