A lithium atom has three electrons, and the $^2$S$_1$$_/$$_2$ ground-state electron configuration is 1$s^2$$2$$s$. The 1$s^2$$2$$p$ excited state is split into two closely spaced levels, $^2$P$_3$$_/$$_2$ and $^2$P$_1$$_/$$_2$, by the spin-orbit interaction (see Example 41.7 in Section 41.5). A photon with wavelength 67.09608 mm is emitted in the $^2$P$_3$$_/$$_2$ $\rightarrow$ $^2$S$_1$$_/$$_2$ transition, and a photon with wavelength 67.09761 $\mu$m is emitted in the $^2$P$_1$$_/$$_2$ $\rightarrow$ $^2$S$_1$$_/$$_2$ transition. Calculate the effective magnetic field seen by the electron in the 1$s$$^2 2p$ state of the lithium atom. How does your result compare to that for the $3p$ level of sodium found in Example 41.7?