What Is the Reason That a Modern Electron Microscope (TEM)

question 52

Multiple Choice

What is the reason that a modern electron microscope (TEM) can resolve biological images to the subnanometer level, as opposed to the tens of nanometers achievable for the best super-resolution light microscope?

• A) The focal length of the electron microscope is significantly longer.
• B) Contrast is enhanced by staining with atoms of heavy metal.
• C) Electron beams have much shorter wavelengths than visible light.
• D) The electron microscope has a much greater ratio of image size to real size.
• E) The electron microscope cannot image whole cells at one time.

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