B1.1.4 - Electron microscopy

Question 1

What is different about electron microscope than light microscopes?

Answer 1

Light microscopes use light to produce and image but electron microscopes use electrons.

Question 2

What are the 2 types of electron microscopes?

Answer 2

Transmission electron microscopes

Scanning electron microscopes

Question 3

What are the advantages of electron microscopes?

Answer 3

It is has a high resolution and the any colour images can be produced.

Question 4

What are the disadvantages of electron microscopes?

Answer 4

It is expensive to buy and operate
It is large and difficult to move
Sample preparation is complex
The specimens have to be dead

Question 5

How does a TEM work?

Answer 5

A beam of electrons pass through a very thin slice of the sample. The beam is focused to produce an image

Question 6

How does an SEM work?

Answer 6

They send a beam of electrons across the surface of a specimen. The reflected electrons are collected to produce an image

Question 7

What kind of images do TEMs produce?

Answer 7

The produce the most magnified images

Question 8

What kinds of images does an SEM produce?

Answer 8

It produces a three dimensional image of a surface

Question 9

What is the resolution of a electron microscope?

Answer 9

Up to 0.1 nm