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Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 40

9702Fundamental particles

What are the structures of the proton and of the neutron in terms of quarks?

  1. Aproton: up quark 1, down quark 1; neutron: up quark 2, down quark 2
  2. Bproton: up quark 1, down quark 2; neutron: up quark 2, down quark 1
  3. Cproton: up quark 2, down quark 1; neutron: up quark 1, down quark 2
  4. Dproton: up quark 2, down quark 2; neutron: up quark 1, down quark 1

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Correct answer: C. proton: up quark 2, down quark 1; neutron: up quark 1, down quark 2

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