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{"ops":[{"attributes":{"bold":true},"insert":"Question 3"},{"insert":"\n\u00a0If the velocity of sound in a solid is of the order 10"},{"attributes":{"script":"super"},"insert":"3"},{"insert":"\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\n\u00a0\n"},{"attributes":{"bold":true},"insert":"Question 4"},{"insert":"\n\u00a04.1\u00a0\u200bThe conductivity of silver is 6.5\u00a0x10"},{"attributes":{"script":"super"},"insert":"7 "},{"insert":"per Ohm per m and number of conduction electrons\u00a0per m"},{"attributes":{"script":"super"},"insert":"3 "},{"insert":"is 6x10"},{"attributes":{"script":"super"},"insert":"28 "},{"insert":"Find the mobility of conduction electrons and the drift velocity in an electric\u00a0field of 1 V\/m. Given m = 9.1 x 10"},{"attributes":{"script":"super"},"insert":"-31"},{"insert":"kg and              e=1.602 x\u00a010"},{"attributes":{"script":"super"},"insert":"-19"},{"insert":"C.\u200b\u200b\u200b\u200b\u200b\u200b\u200b \n\u00a0\n4.2\u200b What is Lorentz number?\u00a0The thermal and electrical conductivities of Cu at 20"},{"attributes":{"script":"super"},"insert":"o"},{"insert":"C are\u00a0390 Wm"},{"attributes":{"script":"super"},"insert":"-1"},{"insert":"K"},{"attributes":{"script":"super"},"insert":"-1 "},{"insert":"and 5.87x10"},{"attributes":{"script":"super"},"insert":"7"},{"insert":"W"},{"attributes":{"script":"super"},"insert":"-1"},{"insert":"m"},{"attributes":{"script":"super"},"insert":"-1"},{"insert":"\u00a0respectively. Calculate Lorentz number.\u200b\u200b\n"}]}

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