Introduction to Microscopes
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Questions and Answers

SEM stands for scanning electron ______

microscope

SEM is an instrument that produces high-resolution and high-magnified images of samples using ______ instead of light

electrons

A beam of electrons produced by an electron gun is placed at the top of the ______

microscope

The anode attracts these electrons and focuses on the ______ lens

<p>magnetic</p> Signup and view all the answers

Once the beam of electrons strikes the target, secondary electrons, backscattered electrons, and x-rays are ejected from the ______

<p>sample</p> Signup and view all the answers

What is the main advantage of using an electron microscope over a light microscope for studying nanoparticles?

<p>The main advantage is the better resolution provided by the electron microscope.</p> Signup and view all the answers

How does a scanning electron microscope (SEM) produce high-resolution and high-magnified images of samples?

<p>SEM produces high-resolution and high-magnified images of samples by using electrons instead of light.</p> Signup and view all the answers

Explain the process of how the beam of electrons in the SEM is focused towards the sample (specimen).

<p>The beam of electrons is focused towards the sample (specimen) by traveling through the magnetic lenses, which focus the beam down towards the sample.</p> Signup and view all the answers

What are the different types of electrons and x-rays ejected from the sample when the beam of electrons strikes the target in SEM?

<p>The different types of electrons and x-rays ejected from the sample are secondary electrons, backscattered electrons, and x-rays.</p> Signup and view all the answers

Why is the resolution of the electron microscope better than that of a light microscope?

<p>The resolution of the electron microscope is better due to the use of matter (electron) waves, which provide better resolution than light.</p> Signup and view all the answers

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