The prominent yellow doublet lines in the spectrum of sodium result from transitions from the 3P3/2 and 3P1/2 states to the ground state. The wavelengths of these two lines are 589.0 nm and 589.6 nm. (a) Calculate the energies in eV of the photons corresponding to these wavelengths. (b) The difference in energy of these photons equals the difference in energy AE of the 3P3/2 and 3P1/2 states. This energy difference is due to the spin-orbit effect. Calculate AE. (c) If the 3p electron in sodium sees an internal magnetic field B, the spin-orbit energy splitting will be of the order of AE = 2μBB, where μB is the Bohr magneton. Estimate B from the energy difference AE found in part (b).