
(a)
The energies of the three lowest states of positronium.
(a)

Answer to Problem 56P
The energies of the three lowest states of positronium is
Explanation of Solution
Positronium is an atom composed of an electron and a Positron and the mass of positron is equal to the mass of electron.
Write the expression to calculate reduced mass.
Here,
Since the mass of positron is equal to the mass of electron above equation can be written as:
Write the expression for effective Rydberg constant.
Here,
Write the expression for energy at
Here,
Conclusion:
Substitute
Similarly for
Thus, the energies of the three lowest states of positronium is
(b)
The wavelengths of the
(b)

Answer to Problem 56P
The wavelengths of the
Explanation of Solution
Write the expression for wavelength.
Here,
Conclusion:
For
Substitute
For
Substitute
For
Substitute
For
Substitute
Thus, the wavelengths of the
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Modern Physics for Scientists and Engineers
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