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Note: 1. Please follow all the Instructions to Candidates given on the cover page of the answer book. 2. All parts of a question should be answered consecutively. Each answer should start from a fresh page. 3. Assumptions made if any, should be stated clearly at the beginning of your answer. Q.1 Q.2 Q.3 Calculate the fraction of ionic character of (i) GaAs, (ii) ZnS, and (iii) AgCl. Comment on the trend you observe. [2M] Q.4 Calculate the planar density and planar packing fraction for the (010) and (020) planes in simple cubic polonium, which has a lattice parameter of 0.334 nm. [2M] Sketch the following directions within a cubic unit cell. Please draw separate unit cell for each direction. a) [122] b) [213] [2M] Sketch the following plane within a cubic unit cell. Please draw separate unit cell for each plane. a) (212) b) (312) [2M] Q.5 Determine the indices for the directions in the cubic unit cell shown in Figure below. [4M] B D 71 Note: 1. Please follow all the Instructions to Candidates given on the cover page of the answer book. 2. All parts of a question should be answered consecutively. Each answer should start from a fresh page. 3. Assumptions made if any, should be stated clearly at the beginning of your answer. Q.1 Q.2 Q.3 Calculate the fraction of ionic character of (i) GaAs, (ii) ZnS, and (iii) AgCl. Comment on the trend you observe. [2M] Q.4 Calculate the planar density and planar packing fraction for the (010) and (020) planes in simple cubic polonium, which has a lattice parameter of 0.334 nm. [2M] Sketch the following directions within a cubic unit cell. Please draw separate unit cell for each direction. a) [122] b) [213] [2M] Sketch the following plane within a cubic unit cell. Please draw separate unit cell for each plane. a) (212) b) (312) [2M] Q.5 Determine the indices for the directions in the cubic unit cell shown in Figure below. [4M] B D 71
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