Microscopy Techniques Quiz

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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?

Only TEMs provide detailed crystallographic data. (C) Signup and view all the answers

What do both SEM and TEM share as essential components?

Lenses and apertures to control the electron beam. (D) Signup and view all the answers

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

It provides very high magnification. (B) Signup and view all the answers

What is a significant disadvantage of using an electron microscope?

It operates in a vacuum, requiring specimens to be completely dry. (D) Signup and view all the answers

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

Scanning Electron Microscope (SEM) (A) Signup and view all the answers

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

It creates images based on the interaction between focused electrons and the sample surface. (C) Signup and view all the answers

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

TEM creates images based on electrons passing through the specimen. (D) Signup and view all the answers

Which characteristic is NOT considered an advantage of electron microscopes?

Inexpensive installation costs. (C) Signup and view all the answers

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

Dried and ultra-thin sections. (A) Signup and view all the answers

What is a common industrial application of electron microscopes?

Quality control and failure analysis. (D) Signup and view all the answers

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

It provides detailed images at the atomic level. (C) Signup and view all the answers

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

Requires samples to be prepared in a specific way. (C) Signup and view all the answers

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

It captures images based on the interaction of an electron beam with the sample's surface. (C) Signup and view all the answers

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

To focus the electron beam on the thin specimen. (C) Signup and view all the answers

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

Samples should be ultrathin, often less than 150 nm in thickness. (D) Signup and view all the answers

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

Using secondary electrons to generate images of the surface structure. (C) Signup and view all the answers

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

Electron beam, lenses, and detectors. (B) Signup and view all the answers

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

It provides the source of high-energy electrons for imaging. (D) Signup and view all the answers