Electron microscopes (AQA A-Level Physics): Flashcards
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Practise the cards
10 cards from this deck
Resolving power of a microscope
Resolving power of a microscope
Ability to differentiate between two closely positioned structures
Why electron microscopes have higher resolving power
Why electron microscopes have higher resolving power
Electron wavelength is shorter than visible light
De Broglie's equation
De Broglie's equation
What improves resolving power in electron microscopes
What improves resolving power in electron microscopes
Decreasing wavelength of electrons
TEM full form
TEM full form
Transmission Electron Microscope
Function of condenser lens in TEM
Function of condenser lens in TEM
Directs and focuses electron beam at sample
Effect of thicker samples in TEM
Effect of thicker samples in TEM
Thicker samples slow electrons, increasing wavelength and reducing resolution
STM full form
STM full form
Scanning Tunnelling Microscope
Principle used by STM
Principle used by STM
Quantum tunnelling of electrons
Two modes of STM operation
Two modes of STM operation
Constant height mode and constant current mode