Conservation laws and particle equations Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. Which of these decays is possible?
- A. p + e⁻ → n + νe
- B. n → p + e⁻
- C. p → e⁺ + π⁰
- D. π⁺ → μ⁺ + ν̄μ
2. What is the lepton number of the products in μ⁻ → e⁻ + ν̄e + νμ?
- A. −1
- B. 0
- C. +1
- D. +3
3. In β⁺ decay, p → n + e⁺ + X, what is X?
- A. An electron antineutrino
- B. An electron neutrino
- C. A photon
- D. A muon antineutrino
4. Which quantity is 0 for a photon?
- A. Baryon number only
- B. Lepton number only
- C. Neither
- D. Baryon number and lepton number
5. A proton changes into a neutron in a nucleus. Which particle must also be emitted?
- A. A positron and a neutrino
- B. An electron and an antineutrino
- C. A positron and an antineutrino
- D. An electron only