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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