Physics (AS & A Level) · Feb / March 2016 · Paper 22 · Question 6
9702
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The question as text
A neutron decays by emitting a β− particle.
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6(a)[2]
p 1 1 ν β− − 0 0 0 1 and
6(b)[1]
an (electron) antineutrino
6(c)[1]
lepton(s)
6(d)(i)[1]
down, down, up / ddu
6(d)(ii)[1]
a down / d (quark) changes to an up / u (quark) or ddu → uud
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