Types of microscopes

  • Created by: teegs.**
  • Created on: 11-04-18 10:21

1. How so SEM's work?

  • They scan a beam of electrons across the specimen. This knocks off electrons from the specimen, which are gathered in a cathode ray tube to form an image.
  • They screen a beam of electrons across a specimen. This knocks off the electrons from the specimen, which are gathered in a cathode ray tube to form an image.
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Other questions in this quiz

2. What organelles CANNOT be viewed by an Optical microscope?

  • smaller organelles- ribosomes, endoplasmic reticulum, lysosomes.
  • nucleus, mitochondria.

3. Why aren't TEM's good at viewing living organisms?

  • Because you have to view the specimen in a vacuum.
  • Because the living organism wont stay still.
  • Because the living organism wont fit under a microscope slide.

4. What are the two types of electron microscopes called?

  • Transmission electron microscopes and Scanning electron microscope.
  • Transmission electron microscope and Screening electron microscope.
  • Transfer electron microscope and Scanning electron microscope.

5. When using a TEM, some parts of the image appear darker. Why?

  • The darker parts appear darker because they're denser, so they absorb more electrons.
  • The darker parts appear darker because they cant be made out quite as well.

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