Q280 · Practice questionSimple familiar2 marks
QUESTION 280 (2 marks)
A display lists quarks as up, down, charm and strange, and lists leptons as electron, electron neutrino, muon and muon neutrino. It lists particles rather than antiparticles.
a)[2 marks]
Identify the two missing quark types and the two missing lepton types.
WORKED SOLUTION
2 marksPractice marking scheme
ANSWER
(a) Quarks: top and bottom. Leptons: tau and tau neutrino.
Worked solution
(a) There are six quark flavours and six lepton types in the syllabus. Complete the third generation in each family; antiparticles are not extra entries in these six-type lists.
Equivalent physically justified methods, alternative valid sketches and consistent units accepted.
Accept sensible significant figures and consistent rounding from stated constants.
Part a: Identify top and bottom.
Part a: Identify tau and tau neutrino.
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