(a)[1]
State the name of the class (group) of fundamental particles that includes a neutrino.
(b(i))[1]
Hadron P has charge $+1e$, where $e$ is the elementary charge. P consists of a down antiquark and one other quark only. Identify one possible flavour of this other quark.
(b(ii))[1]
State the type of hadron that P is.
(c(i))[1]
Nucleus Q decays radioactively to nucleus R, with an antineutrino and another particle X being emitted, as shown in the decay equation $Q \rightarrow R + X + \bar{\nu}$. State which particle X represents.
(c(ii))[1]
Compare the nucleon number of Q with that of R.
(c(iii))[1]
Compare the charge on Q with the charge on R.