E.3.5—Strong nuclear force Topic Practice
E.3.5—Strong nuclear force Topic Practice

IB Physics syllabusPhysics SL/HLFirst assessment 2025
Practise explaining nuclear stability by comparing the strong force with electromagnetic repulsion and deciding when high proton speed is required.
How this is tested
- compare force behaviour by stating strong force is short-range attractive, while EM force is long-range repulsive
- explain a fast proton using the model that it must overcome repulsion to reach the strong-force range
- identify the strong nuclear force in tables or decay questions involving nucleons or quarks
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