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.