4019703
Description
Flashcards by 10ejtatnall, updated more than 1 year ago
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Created by 10ejtatnall
over 8 years ago
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| Question | Answer |
| Define a Lepton | A lepton is a fundamental particle that doesn't interact through the strong force. They include electrons, muons and neutrinos. |
| Define a Hadron | Hadrons are particles that can interact through all 4 fundamental forces. They are split into baryons (made of 3 quarks) and mesons (a quark-anti quark pair) |
| Sort the following particles into lepton, baryon or meson proton neutron electron neutrino muon pion kaon | proton - baryon neutron - baryon electron - lepton neutrino - lepton muon - lepton pion - meson kaon - meson |
| What must be conserved in all reactions? | Charge baryon number lepton number (electron, muon and tau) Energy |
| What is not conserved in the weak interaction? | Strangeness - because its strange. It is however, always conserved in strong interactions. |
| What are lepton numbers? | Numbers associated with any leptons, that must be conserved in all interactions. +1 for leptons -1 for anti leptons 0 for non leptons |
| What are the properties of Up, Down and Strange quarks? | |
| What is the quark combination for protons and neutrons? | Proton = up, up, down (uud) Neutron = up, down, down (udd) |
| What occurs during beta- decay? | A neutron turns into a proton, emitting an electron and an anti electron neutrino. One of the down quarks changes into a up quark. udd --> uud W- force carrier |
| What occurs during beta+ decay? | A proton turns into a neutron, emitting a positron and an electron neutrino. An up quark changes into a down quark uud --> udd W+ force carrier |
| Explain why some interactions are never observed | Because the reaction cannot happen, due to something not being conserved in the reaction |
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