The emission spectrum of sodium is dominated by two emission lines at 589.0 and 589.6 nm.
a. a If these emission lines are the result of transitions from electron energy levels n=2 to n=1 , calculate the average energy difference between the electron energy level n=2 and the electron energy level n=1 .
b. b Suggest a reason why there are two emission lines, at two slightly different wavelengths, from this transition.