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{"ops":[{"attributes":{"bold":true},"insert":"Question 3"},{"insert":"\n\u00a0\nIf the velocity of sound in a solid is of the order 103\u00a0m\/s,\u00a0compare the frequency of the sound wave \u03bb = 20 \u00c5 for (a) a monoatomic system and (b) acoustic waves and optical waves in a diatomic system containing two identical atoms (M=m) per unit cell of interatomic spacing 2.2 \u00c5.\u200b\u200b\u200b\u200b\u200b\u200b(10)\u00a0\n\u00a0\n"},{"attributes":{"bold":true},"insert":"Question 4"},{"insert":"\n\u00a0\n4.1.\u00a0\u200bThe conductivity of silver is 6.5\u00a0x\u00a0107per Ohm per m and number of conduction electrons\u00a0per m3\u00a0is 6\u00a0x\u00a01028. Find the mobility of conduction electrons and the drift velocity in an electric\u00a0field of 1 V\/m. Given m = 9.1 x 10\u201331\u00a0kg and e = 1.602 x\u00a010\u201319\u00a0C.\u200b\u200b\u200b\u200b\u200b\u200b\u200b(5)\n\u00a0\n4.2\u200b What is Lorentz number?\u00a0The thermal and electrical conductivities of Cu at 200C are\u00a0390 Wm-1K-1\u00a0and 5.87 x107W-1m-1\u00a0respectively. Calculate Lorentz number.\u200b\u200b\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(5)\u200b\n"}]}

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