4 Trajectory of a-particles in the
coulomb field of a target nucleus The impact
parameter, b and scattering angle q
are also depicted Example 12 1 In the Rutherford’s nuclear model of the atom, the
nucleus (radius about 10–15 m) is analogous to the sun about which
the electron move in orbit (radius » 10–10 m) like the earth orbits
around the sun