Virtual Labs

Estimation of precipitate size in age hardenable aluminium alloys

Transmission electron microscope uses______ for imaging.

a: X-rays Explanation

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b: Light waves Explanation

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c: Secondary electrons Explanation

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d: Electron beam and magnetic field Explanation

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The true sample thickness of TEM sample can be measured using______.

a: Energy dispersive spectroscopy Explanation

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b: X-ray diffraction Explanation

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c: Electron energy loss spectroscopy Explanation

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d: Electron probe micro analyzer Explanation

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Which technique requires the sample to be thinned to less than 100 nm?

a: Scanning Electron Microscopy (SEM) Explanation

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b: Atomic Force Microscopy (AFM) Explanation

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c: Transmission Electron Microscopy (TEM) Explanation

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d: X-ray Diffraction (XRD) Explanation

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Why is TEM preferred over SEM for imaging nanoscale precipitates?

a: TEM provides higher resolution due to electron transmission through the sample. Explanation

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b: SEM has a higher resolution than TEM. Explanation

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c: TEM cannot image nanoscale precipitates. Explanation

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d: SEM uses transmitted electrons, making it more suitable for nanoscale imaging. Explanation

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Which of the following is a major advantage of TEM over SEM for analysing precipitate morphology?

a: TEM provides diffraction contrast, helping in phase identification. Explanation

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b: SEM can easily image atomic structures. Explanation

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c: TEM has a lower resolution than SEM. Explanation

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d: TEM can only be used for surface imaging. Explanation

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What is the primary limitation of SEM when imaging nanoscale precipitates?

a: SEM uses lower-energy electrons, reducing resolution. Explanation

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b: SEM requires ultra-thin samples for imaging. Explanation

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c: SEM detects secondary and backscattered electrons, which have limited spatial resolution. Explanation

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d: SEM cannot operate at high magnifications. Explanation

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