If we imagine an electron as orbiting the proton, with the orbit of radius 5 x 10 ^-11 m, what are the
(a) electric field halfway between the proton and elecron. Compare it to the electric field in the lightning bolt, which is about 10 ^6 V/m.
(b) Calculate the electric potential energy of such atom and
(c) if the kinetic energy of the electron is -1/2 times the potential energy, what is the total energy of the atom?