Physics GCSE
twenty year gap
What twenty year gap means in Physics GCSE, as defined for AQA.
Definition of twenty year gap
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Reference: AQA
The evidence for the neutron did not arrive until about twenty years after the nucleus became an accepted scientific idea.
Topics that use twenty year gap
Related terms
- agreement with observations
- alpha particle scattering
- changing and replacing models
- concentrated positive charge
- discovery of the electron
- empty space
- energy levels
- experimental evidence
Using twenty year gap in the exam
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