Edexcel IGCSE Physics 7.23 Fusion & fission
Practise comparing fusion and fission by deciding whether nuclear statements describe joined light nuclei, split heavy nuclei or both.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- compare fission as splitting a heavy nucleus with fusion as joining smaller nuclei
- classify table statements about stars, reactors, high pressure and energy release
7.23 Fusion and fission question 1
[Maximum number: 3]
This question is about stars.
The process of energy release in the core of a star is different to the process of energy release in a nuclear reactor in a power station.
Describe how these processes of energy release are different.
- stars use fusion, reactors use fission
- fusion detail, e.g. joining of nuclei / involves light nuclei such as hydrogen
- fission detail, e.g. splitting of nuclei / involves heavy nuclei such as uranium or plutonium
Marking guidance:
- Both fusion and fission needed.
- Condone atoms for nuclei.
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