1. What are the radii of the orbits, and the linear velocities of the electrons when they are in the n=l and n=2 orbits of the hydrogen atom?
2. Using Bohr's model, deduce an analytical expression for the Rydberg constant as a function of un iversal constants.
3. The He+ ion is a one-electron system simi l ar to hydrogen, except that it has 2 protons. Calculate the wavelength of the longest wavelength line in each of the first three spectroscopic series (n=l , 2, 3).