001 100 Question No. 20 Contrast the use of the terms ' scattering and diffraction'as applied to the interaction of xrays or electrons with crystalline materials, distinguishing ciearly between the form of the amplitude distribution obtained The six circles represent atoms forming part of a two-dimensional lattice with unit cell of side 0.3nm Calculate the angles for bragg scattering at the horizontal planes for x-rays of wavelength 0.2nm By summing the individual contributions to the diffracted beam from each of the six atoms compare the intensities for the two lowest orders of diffraction(a b. intensity is proportional to (amplitude)") Question No. 21 Calculate the ideal work of deformation par unit volume in drawing a wire through a die. Express it in terms of the strain in the longitudinal direction Structural composites are now used in significant quantities in military aircraft and aports equipment, e.g. skis, tennis rackets. They are almost always more expensive per pound than the material they replace. Give a few examples of specific products or parts using composites and explain why the composite does a better job If the Hall reduction cell operates with 95% current efficiency, calculate the electrical cost to makeQuestion No. 20 Contrast the use of the terms ‘scattering’ and ‘diffraction’ as applied to the interaction of xrays or electrons with crystalline materials, distinguishing ciearly between the form of the amplitude distribution obtained. The six circles represent atoms forming part of a two-dimensional lattice with unit cell of side 0.3nm. Calculate the angles for bragg scattering at the horizontal planes for x-rays of wavelength 0.2nm. By summing the individual contributions to the diffracted beam from each of the six atoms, compare the intensities for the two lowest orders of diffraction (a.b. intensity is proportional to (amplitude)2 ). Question No. 21 Calculate the ideal work of deformation par unit volume in drawing a wire through a die. Express it in terms of the strain in the longitudinal direction. Question No. 22 Structural composites are now used in significant quantities in military aircraft and aports equipment, e.g. skis, tennis rackets. They are almost always more expensive per pound than the material they replace. Give a few examples of specific products or parts using composites and explain why the composite does a better job. If the Hall reduction cell operates with 95% current efficiency, calculate the electrical cost to make