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Mass-Energy Equivalence

Part of Nuclear Fission & Fusion · GCSE GCSE Physics revision

This equations covers Mass-Energy Equivalence 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 4 of 18 in this topic. Use this equations to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 4 of 18

Practice

13 questions

Recall

25 flashcards

🔢 Mass-Energy Equivalence

Mass-Energy Equivalence
E = mc²
Energy (J) = mass (kg) × speed of light² (3 × 10⁸ m/s)²

This equation explains why both fission and fusion release such enormous energy. The "missing mass" (difference between reactant mass and product mass) is called the mass defect, and it is entirely converted to energy.

Keep building this topic

Read this section alongside the surrounding pages in Nuclear Fission & Fusion. That gives you the full topic sequence instead of a single isolated revision point.

Nuclear Fusion ExplainedNuclear Fission — Key DetailsThe Power of the NucleusNuclear Fission Explained

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

13 questions on Nuclear Fission & Fusion — practise free

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