Nuclear Physics FAQ's! What is nuclear physics? Nuclear physics is the part of physics that deals with the forces, behavior and structures of the nuclei of atoms. What is a nucleus? The nucleus is the center of an atom. What does a nuclear bomb have to do with nuclear physics? When the nuclear reaction such as fission is uncontrolled at fast rate, it results in an atomic explosion. This is what occur in nuclear bomb. What is the difference between a proton and a neutron? A proton has a positive charge and a neutron has no charge. What is an electron? An electron is a negatively charged particle that orbits outside the nucleus. What is a quark? A quark is NOT related to a DORK, it is a fast moving point of energy believed to make up protons and nutrons.