Exam-style question
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In a particle interaction, if the initial lepton number is 2 and the final lepton number is 3, what must have occurred?.
- A.A lepton was created
- B.A lepton was annihilated
- C.A baryon was created
- D.A baryon was annihilated
Model answer
What a good answer should say
- A lepton was created
Explanation
Why this works
The increase in lepton number from 2 to 3 indicates that a lepton has been created in the interaction, as lepton number is conserved in particle interactions.
Common mistake
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