2. Define the following:
(i) Unit cell
(ii) Space lattice
(iii) Lattice parameter and crystallographic planes
(iv) Lattice parameter of unit cell
(v) Crystal system
3. Explain the seven crystal system
4. Differentiate between simple cubic, FCC and BCC.
5.Define atomic packing factor. Calculate its value for body centered cube.
6. Find the fraction of the FCC unit cell volume filled with hard spheres.
7. Find the packing fraction of simple cubic structure.
8. What is atomic radius? calculate it for SC, BCC and FCC.
9. Drive the formula for density and lattice constant.
10. What do you mean by Miller Indices?
11. What are important features of Miller Indices.
12. What do you understand by atomic bonding? Differentiate
between ionic and covalent bonds.
13. Write a short note on covalent bond and metallic bond.
14. What are the differences between crystalline and non-crystalline materials.
15. Write a short note on direct and indirect semiconductor.
16. Find charge densities in extrinsic semiconductor.
17. Prove that a= (nM/ρN)1/3
18. What properties of a semiconductor are determined from Hall effect experiment? Discuss the effects in details. Drive the expression for Hall effect.
19. What is Hall angle? Show that ΘH= tan-1(μB), where symbols have their usual meanings.
20. What is the role of fermi level in an extrinsic semiconductor and N type extrinsic semiconductor.
BY- Md. Shahid Mansoori
M.Tech.(P)
visit also- http://naiqalam.blogspot.com
Comments
Post a Comment