Q224 · Practice questionComplex familiar1 mark
QUESTION 224
A down quark changes to an up quark and emits one gauge boson: . Their charges are and , respectively. Which X conserves electric charge?
(A)
A photon
(B)
A gluon
(C)
(D)
WORKED SOLUTION
1 markAnswer D
ANSWER
D.
Worked solution
. The charged weak boson has this charge; photons and gluons are electrically neutral and has charge .
Equivalent physically justified methods and consistent equivalent units accepted.
Displayed decimals are model answers; accept appropriate significant figures and consistent rounding from stated constants.
Select D.
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