Explain whether the following statements are true or false. (a) When the primary electron beam in the SEM is defocussed to get an electron beam of higher intensity and larger spot size to improve secondary electron signal generated from the specimen, the spatial resolution of the secondary electron image will also be higher.
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- Find the approximate solid angle for a source-detector arrangement whereby a 5-cm diameterdetector is placed 30-cm from a point source which emits gammas isotropically. Formally, onewould find a solid angle by integrating sinθ dθ dφ over appropriate θ and φ limits given by thesize of the detector at the given distance from the source. However, a good approximation is touse the ratio of the detector area to the surface area of a sphere at the detector distance to findthe fraction of 4-pi which the detector coversAn electron microscope passes 1.00-pm-wavelength electrons through a circular aperture 2.00 μm in diameter.What is the angle between two just-resolvable point sources for this microscope?A potential difference of 20 kV is applied across an X-ray tube. The minimum wavelength of X-rays generated is Å.