Q281 · Practice questionComplex familiar1 mark
QUESTION 281
A system contains three antiquarks, one electron and one electron antineutrino. What are its total baryon number B and total lepton number L?
(A)
,
(B)
,
(C)
,
(D)
,
WORKED SOLUTION
1 markAnswer D
ANSWER
D. ,
Worked solution
Each antiquark has baryon number , giving . The electron has and the antineutrino has , giving . Quarks contribute no lepton number.
Equivalent physically justified methods, alternative valid sketches and consistent units accepted.
Accept sensible significant figures and consistent rounding from stated constants.
Select D.
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