Nuclear Fission vs Fusion

Part of Nuclear Fission & Fusion · Section 10 of 18

DiagramUnit: Atomic StructureGCSE

This diagram covers Nuclear Fission vs Fusion within Nuclear Fission & Fusion for GCSE Physics. Revise Nuclear Fission & Fusion in Atomic Structure for GCSE Physics with 13 exam-style questions and 25 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 10 of 18 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

📊 Nuclear Fission vs Fusion

Split-panel diagram: left shows nuclear fission where a large uranium nucleus splits into two smaller nuclei releasing neutrons and energy; right shows nuclear fusion where two hydrogen nuclei merge into helium releasing a burst of energy

Figure 1: Fission (left) splits a heavy nucleus releasing neutrons that trigger a chain reaction; fusion (right) joins light nuclei releasing far more energy per kilogram.

Practice questions for Nuclear Fission & Fusion

What is nuclear fission?

  • A. The joining of two small nuclei to form one larger nucleus
  • B. The spontaneous emission of an alpha particle from a nucleus
  • C. The splitting of a large nucleus into two smaller nuclei
  • D. The absorption of an electron by a nucleus
1 markfoundation

Explain what is meant by a chain reaction in nuclear fission.

2 marksstandard

Quick recall flashcards

What is nuclear fission?
The splitting of a large, unstable nucleus into two smaller nuclei, releasing energy and neutrons
What is nuclear fusion?
The joining of two small, light nuclei to form a larger nucleus, releasing energy

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Comparing Fission and Fusion

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How It Works: Why Mass Converts to Energy

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