Approximately what energy gamma rays would you expect from electron-positron annihilation?
  1. 100 keV
  2. 0.5 MeV
  3. 1 MeV
  4. 5 MeV
  5. 10 MeV



If a hydrogenic atom can be made using either an electron, a muon, or a tauon as the negatively charged particle. Which would have the smallest radius?
  1. electron
  2. muon
  3. tauon
  4. They would all be the same.



What would Yukawa have estimated for the mass of the pion if the nuclear force range had been 10 fm instead of 1 fm?
  1. 10 MeV/c2
  2. 100 MeV/c2
  3. 1 MeV/c2
  4. 0.1 MeV/c2
  5. 1000 MeV/c2



The D- particle has a mass of 1869 MeV/c2 and a charge of -1. What would you expect the mass and charge of its anti-particle to be?
  1. 1869 MeV/c2 and -1
  2. 1869 MeV/c2 and +1
  3. -1869 MeV/c2 and -1
  4. -1869 MeV/c2 and +1
  5. 1869 MeV/c2 and 0



Given the way quarks come together to form baryons and hadrons, why was the choice of color an apt analogy for the forces between various quarks?


You detect a new particle which is made up of quarks and interacts strongly with neutrons and protons. What kind of particle is it?
  1. gauge particle
  2. lepton
  3. hadron
  4. tachyon
  5. escalon



Consider an experiment where you use high energy photons to knock protons out of a nucleus, so-called (γ,p) experiments. What would you expect to happen to the cross sections in the neighborhood of Eγ=294 MeV? [Hint: the rest mass of the Δ+ particle is 1232 MeV/c2 and the mass of a proton is 938 MeV/c2.
  1. There will be a narrow dip in the cross section.
  2. There will be a broad peak in the cross section.
  3. There will be a narrow peak in the cross section.
  4. There will be a broad dip in the cross section.
  5. No protons will be produced at this energy.



Your book explains why neutrons would be stable in a nucleus consisting of neutrons and protons. Why would they be stable in a neutron star?


Why was a collider necessary to create W and Z particles in an accelerator?


Why was it experimentally helpful to use anti-protons in the collider ring to produce W and Z particles instead of using two proton beams?