Posted by Kate on Wednesday, November 7, 2007 at 9:25pm.
Use the formula
h*frequency = E to get the energy of the photon
h is Planck's constant.
The energy of the n=2 state is
E2 = -R/2^2 = -R/4
R is the Rydberg constant for Li, expfressed in Joules. It equals 9 time the Rydberg cosntant of hydrogen, because of the Z=3 charge of the nucleus.
Use the formula
E = En - E2 to get the energy of the upper state
Then use
En = -R/n^2 to get the upper level quantum number, n.
If you find the Rydberg constant expressed in wave numbers (cm^-1) instead of Joules, follow the same procedure but use the wave number of the transition (1/wavelength) instead of the energy of the photon, E.
h c * wavenumber = energy
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