// Exa1.21.4 clc; clear; close; // Given data Rho = 0.3623 * 10^-3;// in Ohm m Sigma = 1/Rho;//in mho/m D = 4.42 * 10^28;// Ge density in atom/m^3 n_d = D / 10^6;// in atom/m^3 e = 1.6 * 10^-19;// in C Mu = Sigma/(n_d * e);// in m^2/V.sec disp(Mu,"The mobility of electron in germanium in m^2/V.sec is");