Part B - 16 Marks Questions

PART B '16' Marks Questions

Anna University Questions

Classical free electron theory

1. Define electrical conductivity. Obtain an expression for electrical conductivity by free electron theory. (AU May/June 2013)

2. Based on the classical free electron theory, derive an expression for electrical conductivity of metals. (AU April/May, 2014)

3. (i) State the assumption of the classical free electron mih model.

(ii) Obtain an expression for the electrical conductivity on the basis of the classical free electron theory. (AU June 2016)

 4. Starting with the classical free electron theory of metals obtain an expression for electrical and thermal conductivity. (AU Dec 2009)

5. (i) List the drawbacks of classical free electron theory.

(ii) Obtain Wiedemann Franz law using the expressions of electrical and thermal conductivity. (AU Nov/Dec, 2015)

 6. (i) Deduce an expression for electrical conductivity of conducting material.

(ii) List any four drawbacks of classical free electrons theory. (AU Dec. 2013)

7. Deduce mathematical expressions for electrical conductivity and thermal conductivity of a conducting material.(AU May/June, 2014)

8. (i) Mention any four postulates of classical free electron theory.

 (ii) Obtain an expression for the thermal conductivity of lagros metal. (AU Nov / Dec, 2013)

9. Write Fermi - Dirac function. Obtain an expression for the density of states. (AU Dec 2015)

10. Obtain an expression for density of states. (AU Dec. 2016)

 11. Explain the meaning of 'density of states'. Derive an expression for the number of allowed states for unit volume To of a solid. (AU May 2017)