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Physics (AS & A Level) · May / June 2025 · Paper 13 · Question 39

9702Fundamental particles

What are the charges on an antidown quark and on an antistrange quark?

  1. Aantidown quark: +1/3 e; antistrange quark: +1/3 e
  2. Bantidown quark: +1/3 e; antistrange quark: −1/3 e
  3. Cantidown quark: −1/3 e; antistrange quark: +1/3 e
  4. Dantidown quark: −1/3 e; antistrange quark: −1/3 e

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Correct answer: A. antidown quark: +1/3 e; antistrange quark: +1/3 e

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