Nuclear fission and nuclear fusion are two different nuclear processes. Both of them release energy.
Compare nuclear fission and nuclear fusion.
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Markscheme
4.4 Nuclear fission and fusion Questions
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.