Module 2 - TEMs Flashcards
Cells, Chemicals for Life, Transport and Gas Exchange
1
Q
How TEMs work… (1)
A
When using a TEM, the electron beam produced from the cathode of the microscope passes through the specimen and is focused by electro-magnets onto a fluorescent.
2
Q
How TEMs work… (2)
A
Air in the tower is removed as it would prevent electrons passing down.
3
Q
How TEMs work… (3)
A
Specimens are placed on a tiny copper grid in the electrons passing down.
4
Q
How TEMs work… (4)
A
The more electron-dense parts of the specimen slow down the electrons.
5
Q
How TEMs work… (5)
A
Fluorescence occurs where electrons strike the screen. The more energy these electrons have, the greater the fluorescence. This creates the image.
