2.1 - 2.2 - Particle Classifications (AQA A Level Physics)

What are leptons?

Group of fundamental particles that are subject to the weak nuclear force but not the strong nuclear force

What do all baryons decay into?

protons

What is the quark composition of a Baryon?

Three quarks

Name a lepton with a rest mass that is less than the electron.

Neutino

What is quark composition of an pi plus

up, anti-down

What are the possible quark compositions for a pi zero?

up, anti-up or down, anti-down.

What is the quark composition of K plus

up, anti strange

What is the quark composition of a K zero

down, anti-strange

What is the quark composition of a neutron

up down down (udd)

What is the quark composition of a proton?

up up down (uud)

What is the quark composition of an anti-baryon?

Three antiquarks

Name the two types of hadron.

baryons and mesons

What is the strangeness of a strange quark?

-1

What is the baryon number of an up quark?

1/3

What is the baryon number of an neutron?

1

What is the Lepton number of a Kaon?

0

Baryon number of an anti-strange quark?

-1/3

What force holds quarks together in Hadrons?

The strong nuclear interaction.

What is a Muon?

An unstable lepton with -1 charge that decays into an electron (and neutrinos).

Name a strange meson.

Kaon/K-meson

Which group of particles can be subject to all four fundamental interactions?

Hadrons

What type of particle are neutrons?

Baryons

What are the three particles produced when a muon decays?

Electron, electron antineutrino and muon neutrino

Which partcicle transmits the strong nuclear force between protons and neutron in the nucleus?

The pion.