B1.1.4

Question 1

What is electron microscopy?

Answer 1

Electron microscopy use electrons instead of light to produce an image.

Question 2

Transmission electron microscopes

Answer 2

Pass a beam of electrons through a very thin slice of a sample. The beam is focused to make an image.

Question 3

Scanning electron microscopes

Answer 3

A beam of electrons passed across the surface. The reflected electrons are collected producing an image.

Question 4

Benefits of light microscopy

Answer 4

Cheap to buy and operate
Small an portable
Simple to prepare a sample
Natural colour of sample is seen unless staining is used
Specimens can be living or dead

Question 5

Benefits of electron microscopy

Answer 5

High resolution