(a)[1]
A lepton is one example of a fundamental particle. State what the term fundamental particle means.
(b)[2]
A lambda particle $\Lambda^0$ is a hadron made up of an up (u) quark, a down (d) quark and a strange (s) quark. Show that the charge on the $\Lambda^0$ particle is zero.
(c(i))[2]
The $\Lambda^0$ particle is unstable. It may decay into a neutron (n) and a pion ($\pi^0$) as shown by $\Lambda^0 \rightarrow n + \pi^0$. The $\pi^0$ particle is made of an up quark and an up antiquark. Compare the properties of an up quark with those of an up antiquark.
(c(ii))[2]
Explain why the neutron is classified as a baryon and the $\pi^0$ particle is classified as a meson.