Exam-style question
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If a baryon decays into a meson and a lepton, how does the baryon number change?.
- A.It increases by 1
- B.It decreases by 1
- C.It remains the same
- D.It decreases by 2
Model answer
What a good answer should say
- It decreases by 1
Explanation
Why this works
In this decay, the baryon (which has a baryon number of +1) transforms into a meson (baryon number 0) and a lepton (baryon number 0). Therefore, the total baryon number decreases by 1.
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