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8.%20Condensed Matter Physics NET-JRF VKS

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Brijmohan
Banaras Hindu University (BHU), Varanasi
PhD Condensed matter Physics

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fiziks Institute for NET/JRF, GATE, IIT-JAM, JEST, TIFR and GRE in PHYSICAL SCIENCES CONDENSED MATTER PHYSICS NET/JRF (JUNE-2011) Q1. A narrow beam of X-rays with wavelength 1.5 is reflected from an ionic crystal with an fcc lattice structure with a density of 3.32 gcm-3. The molecular weight is 108 AMU (1AMU = 1.66 10-24 g) A. The lattice constant is (a) 6.00 Ans: (b) 4.56 (c) 4.00 (d) 2.56 (b) Solution: Given ne f f 4 , M = 108 kg, 3.32 gm cm -3 = 3320 kgm-3, N A 6.023 10 26 atoms kmd a3 ne f f M NA 4 108 6.00 10 30 m 3 6.00 10 10 6.00 A0 6.023 10 26 3320 B. The sine of the angle corresponding to (111) reflection is (a) Ans: 3 4 (b) 3 8 (c) 1 4 (d) 1 8 (b) Solution: According to Bragg s law 2d sin , sin sin 3 2a 2d where d a h2 k 2 l 2 a 3 for (111) plane 3 1.5 A 0 3 3 3 . 0 2 62 8 2 6A Head office fiziks, H.No. 23, G.F, Jia Sarai, Near IIT, Hauz Khas, New Delhi-16 Phone: 011-26865455/+91-9871145498 Website: www.physicsbyfiziks.com Email: fiziks.physics@gmail.com Branch office Anand Institute of Mathematics, 28-B/6, Jia Sarai, Near IIT Hauz Khas, New Delhi-16 1

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