Biol345 Electron Microscopy 2024

Choose the false statement.

• TEM uses electrons that are transmitted through the specimen

• TEM results in the formation of 2D images

• SEM uses electrons to scan the surface of the specimen by deflection

• SEM results in the formation of 2D images

Electron microscopy is used to view specimens that have a longer/shorter wavelength than light?

• Shorter

• Longer

What type of lenses are found in electron microscopes?

• Convex

• Concave

• Electromagnetic

• Glass

Which microscope has a lower operating voltage?

• TEM

• SEM

The function of the stigmator in a transmission electron microscope is to.....

Name the electrons released at point A.

• Backscatter electrons

• Primary electrons

• Transmitted electrons

• Positively charged electrons

Name the lens at point B.

• Condenser lens

• Anode

• Cathode

• Objective lens

A fluorescence screen is found in a _______ electron microscope?

Choose the correct order of the electron pathway in a TEM from the list below:

1. Electrons pass through the thinly sliced sample.

2. Electrons are emitted into the vaccuum tube by the cathode.

3. A stigmator adjusts the electron beam focus.

4. The condenser aperture prepares the beam for the condenser lens.

• 1, 2, 3, 4

• 4, 3, 2, 1

• 2, 4, 3, 1

• 3, 1, 2, 4

Label the 6 parts below in a TEM.