Physics A-Level
Specimen preparation and vacuum requirements
What Specimen preparation and vacuum requirements means in Physics A-Level, as defined for AQA.
Definition of Specimen preparation and vacuum requirements
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Reference: AQA
The specimen must be extremely thin so electrons can transmit through it, and the whole column is evacuated so electrons are not scattered by air.
Topics that use Specimen preparation and vacuum requirements
- Electron microscopes (A-level only) (AQA A-Level)
Related terms
- de Broglie wavelength of electrons
- Energy conservation in electron acceleration
- Feedback control systems
- Order-of-magnitude estimation in physics
- Quantum tunnelling
- Resolution limits of electron microscopes
- Resolution limits of microscopes
- Wave-particle duality and the de Broglie wavelength
Using Specimen preparation and vacuum requirements in the exam
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