A nucleus of uranium absorbs a neutron and undergoes fission. Two or three neutrons are released by the fission.
Explain why the release of these neutrons can lead to a chain reaction.
In a nuclear reactor the chain reaction is controlled. Give the reason why.
40 exam-style questions on AQA GCSE Physics 4.4 Nuclear fission and fusion, covering 4.4.1 Nuclear fission and 4.4.2 Nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.