Cuestionario sobre TEM

List three benefits of using a TEM rather than any other instrument to characterize nanoparticles. 

• High resolution, Structural analysis, Compositional information 

• Low resolution, Limited structural information, No compositional data 

• High magnification, No diffraction, Limited chemical analysis 

• Only chemical analysis, High beam damage, Slow processing

What is the major difficulty with interpreting all TEM images?

• TEM images are 2D projections of 3D objects

• TEM has limited magnification

• TEM images have low resolution

• TEM cannot provide chemical information

Why is TEM so powerful as a characterization tool?

• It is cheaper than other microscopes

• It combines high spatial resolution with analytical techniques 

• It only provides structural information 

• It does not require sample preparation

What signals are most commonly used in conventional TEM?

• Reflected and scattered light

• Transmitted electrons and inelastically scattered electrons

• X-rays and UV light

• Radio waves and infrared signals

What does the acronym TEM stand for?

• Transmission Electron Microscope

• Thermally Excited Microscope

• Temporal Efficiency Measurement

• Thin Electromagnetic Measurement

What are the two signals produced when electrons interact with matter that are used in AEM?

• Reflected light and X-rays

• Characteristic X-rays and inelastically scattered electrons

• Radio waves and UV light

• Gamma rays and scattered protons

What happens to the wavelength of the electron beam when the acceleration voltage of the TEM is increased?

• The wavelength increases

• The wavelength decreases

• The wavelength remains the same

• The wavelength fluctuates randomly

What does 'thin' mean when referring to a TEM sample?

• A sample that is 1 cm thick

• A sample that is thin enough for electrons to pass through

• A sample that cannot be imagined

• A sample that is 1 mm thick

Give an approximate figure for a properly 'thin' TEM sample.

• 10 micrometers

• 50 to 100 nanometers

• 1 millimeter

• 1 to 5 nanometers

Why is TEM so important for materials scientists and nanotechnologists?

• Provides structural and compositional information at the atomic level

• It is economical to use

• Does not require sample preparation

• Has a low energy requirement