Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 40

An isolated neutron decays to produce a proton, a β– particle and an antineutrino. Which row gives the quark composition of the neutron and the proton and the type of force that gives rise to this reaction?

1. Aneutron: down, down, up; proton: down, up, up; type of force: strong interaction
2. Bneutron: down, down, up; proton: down, up, up; type of force: weak interaction
3. Cneutron: down, up, up; proton: down, down, up; type of force: strong interaction
4. Dneutron: down, up, up; proton: down, down, up; type of force: weak interaction

As printed in the paper