(a)[1]
State the meaning of the term fundamental particle.
(b(i))[2]
Particle Q is a meson and has charge $0$. Determine one possible quark composition of Q.
(b(ii))[3]
For particle Q, the mass is $0.67\,\text{u}$ and the kinetic energy is $2.1 \times 10^{-16}\,\text{J}$.\n\nCalculate the speed of particle Q.
(c(i))[1]
Radium-228 ($^{228}_{88}\mathrm{Ra}$) is a radioactive nuclide. State how many electrons are present in a neutral atom of radium-228.
(c(ii))[2]
A radium-228 nucleus undergoes a sequence of decays to produce nucleus X. In the process, $5$ $\alpha$-particles and $4$ $\beta^{-}$ particles are emitted. Determine the number of protons and the number of neutrons in nucleus X.