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Solve the all parts following problem given below:

Problem: The positron is a particle that has the same mass as the electron and carries a charge equal to +e. Positronium is a bound state of an electron-positron combination.

Part A: Calculate the energies of the five lowest energy states of positronium using the reduced mass.

Part B: Do transitions between any of the levels found in Part (a) fall in the visible range of wavelengths? If so, which transitions are they?

I need help to solve the above problem. Thanks.

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