PhysicsChapter 8: Nuclear Physics
Nuclear Fusion
Nuclear fusion
Definition
Nuclear fusion is the process in which light nuclei combine to form a heavier nucleus, with energy released when the final products are more tightly bound.
Why Energy Is Released
Fusion involves light nuclei. General idea: light nucleus + light nucleus → heavier nucleus + energy The product can have greater binding energy per nucleon. Therefore, total final rest mass can be smaller than total initial rest mass. Energy released: **Q=(mi−mf)c²**
Fusion in Stars
Fusion reactions provide the fundamental source of stellar energy. In stars such as the Sun, hydrogen is ultimately converted into helium through sequences of nuclear reactions.
Conditions
Positively charged nuclei electrically repel one another. Very high temperatures in stellar environments help nuclei achieve conditions where nuclear fusion can occur.
Formula / Key Relation
**Q=(mi−mf)c²**
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Nuclear Fusion
Sticky Notes · Quick Revision
FUSION
- Light + light
- → heavier nucleus
- → energy
- Stars → fusion
60-second revision
- Fusion powers stars and is explained by nuclear binding-energy differences.
Did you understand this topic?
Your answer is saved with your learning record. It does not mark the topic as mastered.