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ch44 - Chapter 44 QUARKS LEPTONS AND THE BIG BANG 1 Which...

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Chapter 44: QUARKS, LEPTONS, AND THE BIG BANG 1. Which of the following particles is stable? A. Neutron B. Proton C. Pion D. Muon E. Kaon ans: B 2. The stability of the proton is predicted by the laws of conservation of energy and conservation of: A. momentum B. angular momentum C. baryon number D. lepton number E. strangeness ans: C 3. When a kaon decays via the strong interaction the products must include a: 4. A particle with spin angular momentum ¯ h/ 2 is called a: 5. A particle with spin angular momentum ¯ h is called a: 646 Chapter 44: QUARKS, LEPTONS, AND THE BIG BANG
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6. An example of a fermion is a: A. photon B. pion C. neutrino D. kaon E. none of these ans: C 7. An example of a boson is a: 8. All particles with spin angular momentum ¯ h/ 2: 9. All leptons interact with each other via the: 10. An electron participates in: A. the strong force only B. the strong and weak forces only C. the electromagnetic and gravitational forces only D. the electromagnetic, gravitational, and weak forces only E. the electromagnetic, gravitational, and strong forces only ans: D 11. Which of the following particles has a lepton number of zero? Chapter 44: QUARKS, LEPTONS, AND THE BIG BANG 647
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12. Which of the following particles has a lepton number of +1? 13. π + represents a pion (a meson), μ represents a muon (a lepton), ν e represents an electron neutrino (a lepton), ν μ and p represents a proton represents a muon neutrino (a lepton). Which of the following decays might occur?
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