Edexcel IGCSE Physics · Spec 7.5
Nuclear Fission & Fusion
The difference between nuclear fission and nuclear fusion.
Physics revision video
Nuclear Fission & Fusion
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Spec 7.5
What you need to know
- Describe nuclear fission
- Explain a chain reaction
- Describe nuclear fusion
Active recall
Quick check
Answer each question before opening the answer.
What is nuclear fission?
A large unstable nucleus splits into smaller nuclei, releasing energy and neutrons.
What is nuclear fusion?
Two light nuclei join to form a heavier nucleus, releasing energy — as happens in stars.
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