65 o Excited sodium atoms emit two closely spaced spectrum lines called n= 3, € = 1{ the sodium doublet (Fig. 40-27) with wavelengths 588.995 nm and 589.592 nm. (a) What is the difference in energy between the two upper energy levels (n = 3, € = 1)? (b) This energy %3D %3D difference occurs because the elec- tron's spin magnetic moment can be oriented either parallel or antiparallel to the internal magnetic field associ- ated with the electron's orbital mo- Figure 40-27 Problem 65. tion. Use your result in (a) to find the magnitude of this internal magnetic field. n= 3, € = 0 uu C66'889 589. 592 nm

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