21. Determine the conductivity of a semi-conductor 22. Determine the number of electrons in conduction band in terms of band gap E G and also find the number of holes in valence band. Write a procedure to find the number of electrons in the conduction band of a semiconductor. Derive an expression for the total number of holes in a semiconductor. What is intrinsic concentration of charge carriers in a semiconductor? Derive an expression for carrier concentration in terms of band gap (E G ). Write a short note on conductivity and mobility of semiconductor material. Derive a mathematical expression for electrical conductivity. What do you mean by relaxation time, collision time and mean free path. What is Fermi level? How does it depend on temperature? Derive an expression for Schrodinger wave equation. Derive the expression for conductivity of a semiconductor. What is basic crys
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