Types of microscopes Flashcards

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1
Q

what are the two types of electron microscope

A

Transmission electron microscope, Scanning electron microscope

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2
Q

Give an advantage of transmission electron microscopes

A

Give high resolution images, so shows small objects

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3
Q

Give two disadvantages of transmission electron microscopes

A

Can only be used on thin specimens. Can only be used on non-living specimens. (as it has to be in a vacuum)

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4
Q

Give two advantage of scanning electron microscopes

A

Can be used on thick specimens. Can be 3D

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5
Q

Give two disadvantages of scanning electron microscopes

A

Give lower resolution images than TEM’s. Can only be used on non-living specimens

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6
Q

How does a transmission electron microscope work

A

Uses electromagnets to focus a beam of electrons, which is then transmitted through the specimen.

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7
Q

How does a scanning electron microscope work

A

Scan a beam of electrons across the specimen. Knocking off electrons from the specimen, which are gathered in a cathode ray tube to form an image. (can be 3D)

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