5. Which of the four interactions (strong, electromagnetic, weak, gravitational) does the electron take part in? The neutrino? The proton? 6. Quarks have spin 1/2. How do you account for the fact that baryons have spin 1/2 or 3/2, and mesons have spin 0 or 1?

Match these particle physics descriptions   A class of particles that consist of two quarks   An electron is a member of this class of particles.   A proton is a member of this class of particles   A class of particles that experiences the weak but not the strong nuclear force.   A class of particles that consist of three quarks   A class of particles that experiences strong and weak nuclear forces. 1. Hadrons 2.Mesons 3.Baryons 4.Leptons

Referring to the Feynman diagram, name:a. particle A b. the exchange particle involved c. the force involved in the interaction d. Explain how you know that there has not been a change of quark colour but there has been a change of flavour.

9. Compare the electron, proton, and neutron a) in terms of mass, b) in terms of charge. c) Which of these particles are leptons and which are baryons. Application Questions 10. Use the table of Fundamental Particles and Interactions to answer the following a. What is the unified theory of the weak and electromagnetic interaction called? b. What particles experience the strong force? c. What particles mediate the weak interaction? Which of these is the most massive? 11. For the isotope "Sr find the following: i) the name of the element; ii) the atomic number; iii) the number of protons in the nucleus; iv) the number of electrons in an atom; v) the number of neutrons in the nucleus. 12. For the isotope 14C find the following: i) the name of the element; ii) the atomic number; iii) the number of protons in the nucleus; iv) the number of electrons in an atom; v) the number of neutrons in the nucleus. 13. If the isotope promethium-145 undergoes an alpha decay, find the resulting product.…