A gold nucleus contains 197 nucleons packed tightly against each other. A single nucleon (proton or neutron) has a radius of about 1 × 10−15 m. (a) Calculate the approximate radius of the gold...

A gold nucleus contains 197 nucleons packed tightly against each other. A single nucleon (proton or neutron) has a radius

of about 1 × 10−15 m.

(a) Calculate the approximate radius of the gold nucleus.

(b) Rutherford correctly predicted the angular distribution for 10-MeV (kinetic energy) alpha particles colliding with

gold nuclei. What kinetic energy must alpha particles have in order to make contact with a gold nucleus? (In this

case the angular distribution will deviate from that predicted by Rutherford, which was based solely on electric

interactions.)