Uranium-238 (92238U^{238}_{92}\text{U}92238U) absorbs a single neutron to form a nucleus X X\,X in the first stage of a nuclear reaction sequence:
92238U+n→X ^{238}_{92}\text{U} + \text{n} \rightarrow X 92238U+n→X X→Y+β−+νˉe X \rightarrow Y + \beta^- + \bar{\nu}_e X→Y+β−+νˉe Y→Z+β−+νˉe Y \rightarrow Z + \beta^- + \bar{\nu}_e Y→Z+β−+νˉe Z→W+α Z \rightarrow W + \alpha Z→W+αHow many neutrons are in a nucleus of WWW?
141141141
142142142
143143143
145145145
128 exam-style questions on AQA A Level Physics Radioactivity (A-level only), covering Rutherford scattering (A-level only), $\alpha$ , $\beta$ and $\gamma$ radiation (A-level only), Radioactive decay (A-level only), Nuclear instability (A-level only), Nuclear radius (A-level only), Mass and energy (A-level only), Induced fission (A-level only), and Safety aspects (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.