Question

Draw a Feynman diagram representing an electron interacting with the proton in a hydrogen atom. Draw...

Draw a Feynman diagram representing an electron interacting with the proton in a hydrogen atom.

Draw another diagram with 1 loop that also contributes
to the binding.

This second diagram is one of the contributions to the tiny energy shift observed in the n=2 level of hydrogen due to QED.

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Feynman diagram and explanations are in images below:

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