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Unit 4: Revolutions in modern physics

Quick questions on Fundamental particles and the Standard Model: QCE Physics Unit 4

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is baryons (three-quark composites)?
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Made of three quarks. Examples:
What is mesons (quark-antiquark pairs)?
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Made of one quark and one antiquark. Examples:
What is wrong charge calculation?
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uu has charge +2/3+2/3; dd has charge −1/3-1/3. Proton: uuduud gives +1+1. Neutron: uddudd gives 00.
What is q1?
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State the quark composition of a proton and a neutron. [2 marks]
What is q2?
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Classify the following as baryons, mesons or leptons: pion (π+\pi^+), electron, neutron. [3 marks]
What is q3?
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A muon decays μ−→e−+νˉe+νμ\mu^- \rightarrow e^- + \bar{\nu}_e + \nu_\mu. (a) Identify the family of each particle. (b) Verify lepton number and charge conservation.

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