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In this video I will explain the slight splitting of the energy caused by the interaction of the electron spin and the orbital motion of the electron was 1st from the jump from the 2nd down to the 1st level in the Lymann series of the energy difference of 10.2eV giving off a photon of wavelength of 121.6nm.

Next video in this series can be seen at:
https://youtu.be/rkfdMQ3Vi_A