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A-Level Biology OCR A

Electrons Specimen Image Tem Bits Passed State Stands

Front State what TEM stands for and outline how one works & the properties of its image.
Back TEM - transmission electron microscope
  • Beam of electrons in transmitted through a specimen and focused to produce an image
  • Because some electrons are able to pass through and some aren't, we can generate an image of the internal features of the specimen
  • Image will look 2D because we are passing electrons through a specimen and it will not be in color as we are using electrons and not light
  • Darker bits will be where fewer electrons passed through, lighter bits will be where more electrons passed through

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