(a(i))[1]
State what the number 4 is called in nuclide notation.
(a(ii))[1]
State what the number 2 is called in nuclide notation.
(b(i))[3]
Use the graph in Fig. 12.1 to determine the half-life of the material. Make it clear how the graph was used to reach your answer.
(b(ii))[1]
On Fig. 12.1, sketch the decay curve for this material.