The resolution limit of a microscope is roughly equal to the wavelength of light used in producing the image. Electron microscopes use an electron beam (in place of photons) to produce much higher resolution images, about 0.20 nm in modern instruments. Assuming that the resolution of an electron microscope is equal to the de Broglie wavelength of the electrons used, to what speed must the electrons be accelerated to obtain a resolution of 0.20 nm?
SolutionStep1First ionization energy is the energy required to remove the most loosely held outermost electronfrom an isolated gaseous atom.Since energy has to be supplied to remove the electron,the valueof ionization energy is always positive.NOTE:(Whenever energy is absorbed or supplied to an atom, its sign will be positive.Whenever energy is released or taken away from an atom ,its sign will be negative.)Electron affinityAs the name suggests, electron affinity is the ability of an atom to accept an electron.The morethe electron affinity value,the higher an atoms affinity for electronsNOTE:(Atoms that become more stable with the addition of an electron show a decrease in potentialenergy; i.e. the energy gained by the atom appears to be negative(or in other words energy isreleased). For atoms that become less stable upon gaining an electron, potential energy increases,which implies that the atom gains energy. In such a case, the atom's electron affinity value ispositive.)