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Q2-The metal iridium has an FCC crystal structure. If the angle of diffraction for the (220) set of planes occurs at 69.22 (first-order reflection) when

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Q2-The metal iridium has an FCC crystal structure. If the angle of diffraction for the (220) set of planes occurs at 69.22 (first-order reflection) when monochromatic X-radiation having a wavelength of 0.1542 nm is used, compute (a) the interplanar spacing for this set of planes, and (b) the atomic radius for an iridium atom

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