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QUESTION 15 Which Feynman diagram shows an electron interacting with another electron? (A) (B) Space Space Time Time © (D) Space Space Time Time
QUESTION 14 Which Feynman diagram correctly depicts neutron decay? (A) Space (B) Space (©) Space (D) Space Time
QUESTION 26 (1 mark) Carbon-14 undergoes nuclear decay to nitrogen-14. 1§C 1?N+e_ + 7 List the two types of particles whose total number must be conserved in this reaction.
QUESTION 5 (3 marks) The Feynman diagram for a particle interaction is shown. Space Time Describe the particle interaction taking place.
QUESTION 1 The correct definition of lepton number is (A) the total number of leptons in a particle interaction. (B) a conserved quantum number defined by L = n; ny. (C) the number of leptons remaining after a particle interaction. (D) astrictly conserved additive quantum number of a system defined by B = é (ng ng).
QUESTION 17 The Feynman diagram below represents an interaction of particles. Space Time Select which particle interaction is represented by the diagram above. (A) aneutron decaying into a proton (B) aproton decaying into a neutron (C) an electron and electron interaction (D) an electron and positron interaction
QUESTION 24 (3 marks) Explain one possible interaction between an electron and a positron. Clearly label the Feynman diagram below to support your answer. Space Time Note: If you make a mistake in the diagram cancel it by ruling a single diagonal line through your work and use the additional diagram on page 10 of this question and response book.
QUESTION 7 An electron and positron can annihilate into a photon producing another electron and positron pair in the process. An outcome of this interaction is that (A) total mass decreases. (B) fewer baryons will be produced. (C) the lepton number does not change. (D) the number of particles will decrease.
QUESTION 12 What is a consequence of symmetry in particle interactions? (A) (B) (C) (D) The law of conservation of momentum is obeyed. Charges on particles will always be different. Antiparticles travel backwards through time. Total mass of the particles will decrease.
QUESTION 28 (2 marks) The Feynman diagram for a neutron decaying into a proton and electron is shown. Space Time Describe the significance of the electron antineutrino in this particle interaction.
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