Q100 · Practice questionComplex unfamiliar5 marks
QUESTION 100 (5 marks)
Consider the weak interaction . Determine the total baryon number, total electron-family lepton number and total electric charge before and after the interaction, and state whether each is conserved.
WORKED SOLUTION
5 marksPractice marking scheme
ANSWER
Baryon number: ; electron lepton number: ; charge: . All three are conserved.
Worked solution
Before the interaction: , , so total . Electron-family lepton number is and , so total . Charge is .
After the interaction: , , so total . Electron-family lepton number is . Charge is .
Thus baryon number, electron-family lepton number and electric charge are all conserved.
Calculates baryon number before and after.
Calculates lepton number before and after.
Calculates charge before and after.
States all are conserved.
Uses correct particle quantum numbers consistently.
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