Electron microscope

Question 1

Electron microscopes use electrons to view image how does this increase resolution

Answer 1

This greatly increases the resolution of electron microscopes compared to optical microscopes, giving a more detailed image

A beam of electrons has a much smaller wavelength than light, so an electron microscope can resolve (distinguish between) two objects that are extremely close together

Question 2

Maximum amount of resolution in electron microscope

Answer 2

This means electron microscopes have a maximum resolution of around 0.0002 µm or 0.2 nm (i.e. around 1000 times greater than that of optical microscopes)

This means electron microscopes can be used to observe small organelles such as ribosomes, the endoplasmic reticulum or lysosomes

Question 3

Maximum amount of useful magnification in electron microscope

Answer 3

The maximum useful magnification of electron microscopes is about ×1,500,000

Question 4

types of electron microscope

Answer 4

TEM transmission electron microscope

SEM scanning electron microscope

Question 5

Electron microscopes fire a beam of electrons at the specimen either a broad static beam (transmission) or a small beam that moves across the specimen (scanning)
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Answer 5

The electrons are picked up by an electromagnetic lens which then shows the image