Flashcards
Quarks and Leptons
Cards in this deck (22)
- 1What groups can we divide subatomic particles (and antiparticles) into?Leptons and Hadrons
- 2What properties do Leptons have?They don't contain quarks, so don't feel the strong force
- 3What properties do Hadrons have?They contain quarks, so are subject to the strong force
- 4What 2 kinds of Hadrons are there?Baryons and Mesons
- 5What are Baryons made up of?Either 3 quarks OR 3 antiquarks
- 6What are Mesons made up of?1 quark and 1 antiquark
- 7Give 3 examples of leptons:Electrons, Neutrinos and Muons
(note Muons can decay into electrons) - 8Give 2 examples of Baryons:Protons and Neutrons
- 9Give 2 examples of MeasonsPions and Kaons
- 10Leptons and quarks are believed to be.....Fundamental particles (don't break down into anything smaller)
- 11What are the 6 quark flavours and their symbols?Up (u) , Down (d) , Strange (s) , Charm (c) , Top (t) , Bottom (b)
(Only need to be aware of c, t and b, don't have to know their properties) - 12What do we do to the symbols to represents the flavour's antiquark?Put a bar above them
- 13For a u quark, what is the charge, baryon number and strangeness?+2/3 e , +1/3 , 0
- 14For a d quark, what is the charge, baryon number and strangeness?-1/3 e , +1/3 , 0
- 15For an s quark, what is the charge, baryon number and strangeness?-1/3 e, +1/3 and -1
- 16If we add up the charge or strangeness of the quarks composing a Hadron, what do we get?The charge or strangeness of that Hadron
(e.g. 2/3 e + 2/3 e - 1/3 e = +1e C) - 17Due to all quarks having a Baryon number of +1/3, any Baryon has a Baryon number of.....+1
- 18Due to all antiquarks having a Baryon number of -1/3, any Antibaryon has a Baryon number of.....-1
- 19What is the Baryon number of Mesons?0 , as made up of a quark and an antiquark
- 20What is the quark composition of a proton?uud (antiproton has lines on top)
- 21What is the quark composition of a neutron?udd (antineutron has lines on top)
- 22What does quark confinement mean?It's impossible for a quark to exist on its own
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