HSC Physics Fundamental Particles

/
  1. What is meant by the term fundamental particle?
  2. Is a neutron a fundamental particle?
  3. List three fundamental particles.
  4. Is a photon a fundamental particle?
  5. Is a positron a fundamental particle?
  6. Do an electron and a positron have opposite spins?
  7. In beta minus decay a neutron "converts" into a proton. How can a neutron convert into a proton?
  8. Radioactive materials emit gamma rays. Where does the energy of a gamma ray come from?
  9. Does a positron have a negative energy? [No, Dirac said that this would make the "dynamical relations all wrong", see Physics Today, June 2001, p63]
  10. Does a fundamental particle have a radius? [no]
  11. This year the radius of a proton was measured as 0.831±0.014 fm. This is given in Nature , 575, 61-62, 2019