Question Bank - WordPress.com Bank Engineering Physics I ... Show that atomic packing factor for FCC...
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Question Bank Engineering Physics I PH6151 Department of Physics Page 1 UNIT - I – CRYSTAL PHYSICS PART – A 1. What is crystallography? 2. Distinguish crystalline and non-crystalline materials. 3. Define lattice? 4. What is space lattice? 5. What is basis? 6. Define crystal structure? 7. Define the terms two dimensional lattice, lattice plane, lattice points. 8. What is unit cell? 9. What is primitive and non- primitive cell? 10. What are lattice parameters? 11. Define the terms interfacial axes and interfacial angles. 12. Name the seven crystal systems. 13. What are Bravais lattices? 14. Define the term coordination number. Give its importance. 15. Define the term nearest neighboring distance. 16. Define atomic radius. 17. What is atomic packing factor? 18. What are Miller indices? 19. Give the procedure to find Miller indices. 20. What are the important features of Miller indices? 21. Sketch the 100, 001, 101 and 111 planes of simple cubic structure. 22. Draw separately the principal (100), (110) and (111) in a simple cubic crystal. 23. Deduce a relation between an interlinear distance ’d’ and the Miller indices of the planes for cubic crystal. 24. Obtain an expression for interplanar spacing between two adjacent planes of Miller indices for (hkl)) in a cubic crystal 25. Show that the interplanar spacing between (hkl) planes in a cubic lattice is given by d hkl = a 26. The edge of the unit cell of cubic lattice is ‘a’. The radius of the atoms that occupy the lattice site is ‘r’. Compute: (i) Number of atoms per unit cell, (ii) atomic radius, (iii) the packing fraction for SC,BCC,and FCC crystal structure. 27. Which type of the cubic crystal structure has closest packing of atoms? How many nearest neighbours does an atom in this type of crystal have? Drive the relation between the atomic radius and the unit cell dimension of the crystal. 28. Show that the FCC structure possesses maximum packing density and minimum percentage of void space among the three crystal structures SC, BCC and FCC.
Question Bank - WordPress.com Bank Engineering Physics I ... Show that atomic packing factor for FCC ... spacing of a cubic crystal in terms of lattice constant and
