State one structural feature that the two atoms have in common.
State one way in which the structures of these two atoms are different.
Complete the equation for this decay: $^{239}_{94}\text{Pu} \rightarrow \,^{\;\;}\text{U} + \,^{\;\;}\alpha$.
Calculate the count rate after $1.2 \times 10^{5}$ years have passed.
On Fig. 10.1, draw the alpha-particle path in the magnetic field.
Explain why the alpha-particle travels along the path you drew in (b)(iii)1.
State what is meant by nuclear fission.
State what happens to a plutonium-239 nucleus in the nuclear reactor to cause fission.
State one advantage of generating electricity in a nuclear power station instead of using an oil-fired power station.
State one advantage of generating electricity in a nuclear power station instead of using an array of wind turbines.