Particle Interactions

• Name the 4 fundamental force

  Gravity, electromagnetic, strong and weak nuclear
• The virtual photon is the exchange particle of which force

  The electromagnetic force
• What type of particles are affected by the strong nuclear force

  Hadrons
• What is the exchange particle of the weak nuclear force

  The W boson (W+ or W-)
• What does the electromagnetic force act on

  It acts on charged objects, for example when a positively charged ball repels another positively charged ball
• When does weak nuclear interaction occur

  When quark character changes (a quark changes into another quark), it affects all types of particle
• Which properties must be conserved in particle interactions

  • Energy
  • Charge
  • Baryon Number
  • Lepton Number
  • Momentum
  • Strangeness (only for strong interactions)