Microscopy Techniques Quiz
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Questions and Answers

What is an advantage of using a Scanning Electron Microscope (SEM) compared to a Transmission Electron Microscope (TEM)?

  • SEMs provide crystallographic data.
  • SEMs require more sample preparation.
  • SEMs create higher resolution images.
  • SEMs can examine larger samples. (correct)
  • Which statement is true regarding the working principle of Transmission Electron Microscopes (TEM)?

  • TEMs use a beam of electrons reflected off the surface of samples.
  • TEMs are best suited for examining bulk materials.
  • TEMs require samples to be thin enough for electrons to penetrate. (correct)
  • TEMs operate without the need for a vacuum environment.
  • What is a common disadvantage of Transmission Electron Microscopes (TEM) compared to Scanning Electron Microscopes (SEM)?

  • TEMs can analyze thicker samples.
  • TEMs take less time to create an image.
  • TEMs require no sample preparation.
  • TEMs cost more to operate. (correct)
  • Which feature distinguishes Scanning Electron Microscopes from Transmission Electron Microscopes?

    <p>Only TEMs provide detailed crystallographic data.</p> Signup and view all the answers

    What do both SEM and TEM share as essential components?

    <p>Lenses and apertures to control the electron beam.</p> Signup and view all the answers

    Which statement accurately describes an advantage of using an electron microscope?

    <p>It provides very high magnification.</p> Signup and view all the answers

    What is a significant disadvantage of using an electron microscope?

    <p>It operates in a vacuum, requiring specimens to be completely dry.</p> Signup and view all the answers

    Which type of electron microscope is designed to magnify up to 2 million times?

    <p>Scanning Electron Microscope (SEM)</p> Signup and view all the answers

    How does a Scanning Electron Microscope (SEM) create a magnified image?

    <p>It creates images based on the interaction between focused electrons and the sample surface.</p> Signup and view all the answers

    Which of the following is true about the Transmission Electron Microscope (TEM)?

    <p>TEM creates images based on electrons passing through the specimen.</p> Signup and view all the answers

    Which characteristic is NOT considered an advantage of electron microscopes?

    <p>Inexpensive installation costs.</p> Signup and view all the answers

    What type of specimen preparation is typically required for electron microscopy?

    <p>Dried and ultra-thin sections.</p> Signup and view all the answers

    What is a common industrial application of electron microscopes?

    <p>Quality control and failure analysis.</p> Signup and view all the answers

    What is a significant advantage of using a Transmission Electron Microscope (TEM)?

    <p>It provides detailed images at the atomic level.</p> Signup and view all the answers

    Which of the following is a disadvantage of using an electron microscope?

    <p>Requires samples to be prepared in a specific way.</p> Signup and view all the answers

    Which statement best describes the primary working principle of a Scanning Electron Microscope (SEM)?

    <p>It captures images based on the interaction of an electron beam with the sample's surface.</p> Signup and view all the answers

    What is the primary function of the condenser lens in a TEM?

    <p>To focus the electron beam on the thin specimen.</p> Signup and view all the answers

    Which type of sample preparation is essential for using a TEM?

    <p>Samples should be ultrathin, often less than 150 nm in thickness.</p> Signup and view all the answers

    Which of the following features is unique to Scanning Electron Microscopes (SEMs)?

    <p>Using secondary electrons to generate images of the surface structure.</p> Signup and view all the answers

    What are the main components involved in the structure of a scanning electron microscope (SEM)?

    <p>Electron beam, lenses, and detectors.</p> Signup and view all the answers

    What role does the electron gun play in both SEM and TEM?

    <p>It provides the source of high-energy electrons for imaging.</p> Signup and view all the answers

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