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6. the process of colliding a particle and its antiparticle together is called

  • anti neutrino
  • annihilation
  • pair production

7. which property is not always conserved in interactions

  • baryon number
  • strangeness
  • charge
  • lepton number

8. alpha decay produces

  • a helium nucleus
  • an electron and an anti neutrino
  • a positron and neutrino

9. the definition of an isotope is

  • atom of the same element with the same number of protons but different number of electrons
  • atom of the same element with the same number of protons but different number of neutrons
  • atom of the same element with the same number of neutrons but different number of protons

10. what is the exchange particle in the electromagnetic force

  • pion
  • virtual photon
  • graviton
  • w+ w- or z