Virtual Labs

1. Can biological samples be seen under TEM?
Note: Since liquid nitrogen is used near sample, the sample can be frozen to avoid any damage from electron beam (and also resist any evaporation).

a: yes b: No

2. The internal structure does not change during crushing of this material:

a: Ductile material b: Semi-crystalline c: Brittle material d: Metals

3. Usually a copper grid is used in TEM holder for:

a: Providing conductive path to materials b: Supporting the powder material for imaging c: Serving as source of electron-beam in TEM d: Providing cooling to the heated sample

4. The carbon coating on copper grid is used for:

a: Enhancing the conductivity of the copper b: Supporting the nanocrystalline powders from falling off within the grid-openings c: Enhancing the intensity of the electron beam d: Adding the lubricative properties of carbon

5. Typically, what thickness of material is transparent to electrons (say at 200 keV)?

a: < 200 nm b: < 2 µm c: < 20 µm d: < 200 µm

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