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Use Rydberg's formula for spectral lines of hydrogenic atoms:

1/lambda = R Z2 ( ( 1/n12) - ( 1/n22) )

where R, the Rydberg constant, is such that Rhc = 13.61 eV

(c is the speed of light, h is Planck's constant).

not really sure where to begin, do I solve for the wavelength and use that in the energy equation E=hc/lambda??