Assignment Questions
ASSIGNMENT QUESTIONS
Unit- I
1. Describe Davisson and Germer’s experiment for the study of electron diffraction.
2. Derive Schrodinger’s time-independent wave equation and explain the significance of wave function.
3. Derive Eigen values and Eigen functions for a particle in a one-dimensional potential box.
Unit-II
1. Explain the Kronig - Penny model of solids and show that it leads to energy band structure.
2. Explain the concept of the effective mass of an electron and derive an expression for it.
3. Explain the classification of materials into insulators, semiconductors and conductors based on band theory.
Unit- III
1. Derive an expression for electron concentration in an intrinsic semiconductor.
2. Derive an expression for carrier concentration in p-type semiconductors and explain the variation of Fermi level with temperature and concentration of dopants in p-type semiconductors.
3. Explain Hall Effect and derive an expression for the Hall coefficient.
Unit-IV
Describe the construction and working of the Nd-YAG laser with the necessary diagrams.
Explain the construction and working of the He-Ne laser with the necessary diagrams.
Explain the acceptance angle and derive an expression for the acceptance angle of an optical fiber. How it is related to Numerical aperture?
Unit- V
Classify electronic polarization, and derive an expression for electronic and ionic polarizability.
Derive the relation for the local field in a dielectric.
Explain the origin of the magnetic moment, Derive the relation for the orbital magnetic moment of the electron.
Explain the classification of magnetic materials.