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WorksheetsCHM3402_Revisions_Other spectroscopic techniques
Total questions: 20
Worksheet time: 9mins
Which of the following is the primary difference between SEM and TEM?
SEM uses light while TEM uses electrons
SEM provides 2D images, TEM provides 3D images
SEM scans the surface; TEM transmits electrons through the specimen
TEM uses X-rays; SEM uses visible rays
In SEM, what type of electrons are mainly used to form the image?
Transmitted electrons and inelastic scattering
Backscattered electrons and secondary electrons
Auger electrons and backscattered electron
Characteristic X-rays
What kind of sample preparation is typically required for TEM compared to SEM?
Coating with gold only
No sample preparation needed
Thin sectioning can be up to 500 nm for TEM samples but SEM sample must be thin
Thin sectioning for TEM sample cannot be thicker than 200 nm
Which technique typically requires a vacuum environment for imaging?
Light microscopy only
Both SEM and TEM
TEM only
SEM only
Which microscopy technique is better suited for imaging internal structures at atomic resolution?
SEM
TEM
XPS
EDX
What type of image is typically produced by a TEM?
3D surface topography
Depth profile
2D internal structural image
Color-enhanced micrograph
Which of the following signals is NOT used in TEM but is common in SEM?
Secondary electrons
Transmitted electrons
Electron diffraction
elastic scattering electron
Which technique is more suitable for viewing surface morphology?
X-ray image
TEM
Light microscopy
SEM
What is the primary purpose of using EDX in SEM or TEM?
To obtain high-resolution images
To analyze the crystal structure
To measure the sample's thickness
To identify the elemental composition of a sample
In which instrument is EDX more commonly used due to ease of sample handling and setup?
TEM
SEM
XRD
Raman
Which of the following elements is typically not well detected by EDX?
Carbon (C)
Iron (Fe)
Copper (Cu)
Gold (Au)
What is a common application of TEM in the field of nanotechnology?
Surface roughness profiling
Imaging nanoparticles and their internal structure at atomic resolution
Detecting optical properties of nanomaterials
Measuring electrical conductivity
SEM is particularly useful in forensic science for which of the following reasons?
DNA sequencing
Determining isotopic composition
Analyzing fracture surfaces and gunshot residues
Amplifying genetic material
What kind of light is typically used in Raman spectroscopy?
X-rays
Infrared light
Ultraviolet radiation
Monochromatic visible or near-infrared laser light
Which of the following is a key advantage of Raman spectroscopy over infrared (IR) spectroscopy?
Raman can analyze aqueous samples easily
Raman requires a vacuum
Raman needs more sample preparation
IR is more sensitive to symmetrical molecules
In Raman spectroscopy, a Stokes line occurs when the scattered photon has (a) energy than the incident photon.
The difference in energy or frequency between the incident light and the scattered light in Raman spectroscopy is called the (a) scattering.
Stokes and anti-Stokes lines in Raman spectroscopy refer to:
Different types of laser sources
Different types of detectors
Energy loss and gain during scattering
Types of polarizations
The component that generates the electron beam in both SEM and TEM is called the (a) .
In (a) emission sources, electrons are emitted when the filament is heated to a high temperature.
