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A-Level Biology OCR A

Electrons Sem Surface State Stands Outline Works Properties

SEM (Scanning Electron Microscope) uses reflected electrons from a specimen's surface to create a detailed, 3D image, revealing surface topography but not internal structures.

SEM stands for Scanning Electron Microscope. It works by directing a beam of electrons across a specimen's surface, collecting the reflected electrons to produce a detailed 3D image of the surface features, but not the interior.

Front State what SEM stands for and outline how one works & the properties of its image.
Back SEM - scanning electron microscope
  • Beam of electrons is sent across the surface of a specimen and the reflected electrons are collected
  • Because electrons are reflected, you can see the specimen's detailed surface features but not the interior
  • Image produced will look 3D and it will not be in color because we are using electrons for imaging, not light

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