An Electron Microscope Must Use Electromagnet 'Lenses'shaped Like Donuts to Direct

question 31

Multiple Choice

An electron microscope must use electromagnet 'lenses'shaped like donuts to direct the electrons onto the specimen.Why aren't they solid,like the lenses in a light microscope?

• A)A magnetic field cannot be applied across a completely solid object-there must be an opening within the object for the field to be applied through.
• B)The user has to be able to physically look through the magnets to focus the beam of electrons onto the specimen,since the metal of the magnets is opaque.Without a hole in the middle,the user wouldn't be able to see!
• C)The electrons would destroy the electromagnet material unless there was a physical hole for them to travel through on their way to the specimen.
• D)Electrons are particles,and particles cannot travel through a solid item.The hole in the middle allows them to travel from the source of the electrons to the specimen.

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Definitions:

Researchers

Individuals who conduct systematic investigations to establish facts or principles or to collect information on a subject, aiming to expand knowledge.

Conclusions

Represents the final part of something, such as a research study or argument, summarizing the findings or the main points made.

Depressed People

Individuals experiencing depression, a mood disorder characterized by persistent feelings of sadness, loss, or anger that interfere with daily activities.

Perceived

To become aware or conscious of something through the senses, especially sight.