of Example 15.1: Calculate the radius of the ISS 3"d orbit of the electron in hydrogen atom.Example 15.2: In a Rutherford scattering experiment, assume that an incident alpha particle (radius 1.80 fm) is moving directly toward a target gold nucleus (radius 6.23 fm). If the alpha particle stops right at the surface of the gold nucleus, how much energy did it have to start with?Example 15.3: Determine the energies of the first two excited states of the electron in hydrogen atom. What are the excitation energies of the electrons in these orbits