(a)[2]
State the class (group) for each of these particles: electron; neutron; neutrino; proton.
(b(i))[2]
A proton can decay into a neutron and two other particles. Complete the equation below so that it shows this proton decay: $^{1}_{1}p \rightarrow \; \ldots\, n + \ldots + \ldots$
(b(ii))[1]
Write an equation for this decay using quark composition.
(b(iii))[1]
State the name of the force that causes this decay.