# AS AQA Physics Unit 2

Flashcards by 10ejtatnall, updated more than 1 year ago
 Created by 10ejtatnall over 5 years ago
13
0

### Description

Quarks and Leptons

## Resource summary

 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

### Similar

GCSE AQA Physics - Unit 3
AQA Physics P1 Quiz
Using GoConqr to study science
GCSE AQA Physics 1 Energy & Efficiency
Waves
Forces and their effects
Forces and motion
Junior Cert Physics formulas
OCR Physics P4 Revision