Problem 5.2
In view of Problem 5.1, we can correct for the motion of the nucleus in hydrogen by simply replacing the electron mass with the reduced mass.
(a) Find (to two significant digits) the percent error in the binding energy of hydrogen (Equation 4.77) introduced by our use of 
instead of 
(b) Find the separation in wavelength between the red Balmer lines 
for hydrogen and deuterium (whose nucleus contains a neutron as well as the proton).
(c) Find the binding energy of positronium (in which the proton is replaced by a positron—positrons have the same mass as electrons, but opposite charge).
(d) Suppose you wanted to confirm the existence of muonic hydrogen, in which the electron is replaced by a muon (same charge, but 206.77 times heavier). Where (i.e. at what wavelength) would you look for the “Lyman-α” line 
?
Solution:
Problem 5.2 Solution (Download)
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