A-LevelPhysicsNuclear physicsMay/June 2018Paper 2 Q74 Marks
A graph of nucleon number A against proton number Z is shown in Fig. 7.1. [Figure 7.1] The graph shows a cross (labelled P) that represents a nucleus P. Nucleus P decays by emitting an α particle to form a nucleus Q. Nucleus Q then decays by emitting a β⁻ particle to form a nucleus R.
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