(a)[1]
Define what is meant by the half-life of a radioactive source.
(b(i))[3]
Complete the nuclear equation for this decay. $^{234}_{91}\text{Pa} \rightarrow$
(b(ii))[1]
State the change that takes place in the nucleus during the decay.
(c)[2]
Give two reasons why $\alpha$-particles produce more ionisation than $\beta$-particles.