Each hydrogen-atom line of Prob. 6.18 shows a very weak nearby satellite line. Two of the satellites

Question:

Each hydrogen-atom line of Prob. 6.18 shows a very weak nearby satellite line. Two of the satellites occur at the vacuum wavelength 656.29 nm and 486.14 nm.
(a) Explain their origin. (The person who first answered this question got a Nobel Prize.)
(b) Calculate the other two satellite wavelengths.