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{"ops":[{"insert":"\f\n"},{"attributes":{"italic":true,"bold":true},"insert":"Question 1"},{"insert":"\u200b\u200b\u200b\u200b\u200b\u200b\u200b\u200b\u200b\u200b\u200b\u200b\n\u00a0\nCompute the net potential energy of a simple\u00a0Na+Cl-\u00a0pair. The equilibrium distance between the ions is\u00a00.28nm. The potential energy due to repulsion between electron sis given by Ur\u00a0= \u03b2\/r8\u200b\u200b\u200b(10)\n"},{"attributes":{"bold":true},"insert":"Question 2"},{"insert":"\n"},{"attributes":{"italic":true},"insert":"2.1 \u03b1-Co\u00a0"},{"insert":"has an\u00a0"},{"attributes":{"italic":true},"insert":"hcp\u00a0"},{"insert":"structure with lattice spacings of\u00a0"},{"attributes":{"italic":true},"insert":"a=\u00a0"},{"insert":"2.51 A0\u00a0and c = 4.07\u00a0A0, \u03b2\u00a0"},{"attributes":{"italic":true},"insert":"Co\u00a0"},{"insert":"is\u00a0"},{"attributes":{"italic":true},"insert":"fcc,\u00a0"},{"insert":"with a cubic lattice spacing of 3.55 A0. What\u00a0is the difference in density between the two forms?\u200b\u200b(5)\n\n2.2 Sodium transform from bcc to hcp at about T = 23K. Assuming that the\u00a0density\u00a0remains\u00a0fixed, and the c\/\u00a0"},{"attributes":{"italic":true},"insert":"a\u00a0"},{"insert":"ratio isideal,\u00a0calculate\u00a0the\u00a0"},{"attributes":{"italic":true},"insert":"hcp\u00a0"},{"insert":"lattice\u00a0spacing\u00a0"},{"attributes":{"italic":true},"insert":"a\u00a0"},{"insert":"given\u00a0that the\u00a0cubiclattice\u00a0spacing\u00a0"},{"attributes":{"italic":true},"insert":"a'\u00a0"},{"insert":"=\u00a04.23\u00a0A0\u00a0in\u00a0the\u00a0cubic\u00a0phase.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u200b\u200b\u200b\u200b\u200b\u200b\u200b\u200b(5)\n\n"}]}

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