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+// Exa 3.21.8

+clc;

+clear;

+close;

+//Given data

+n_i = 2.5 * 10^13;

+Mu_n = 3800;

+Mu_p = 1800;

+q = 1.6 * 10^-19;// in C

+Sigma = n_i * (Mu_n + Mu_p) * q;// in (ohm-cm)^-1

+Rho = 1/Sigma;// in ohm-cm

+Rho= round(Rho);

+disp(Rho,"The resistivity of intrinsic germanium in ohm-cm is");

+N_D = 4.4 * 10^22/(1*10^8);// in atoms/cm^3

+Sigma_n = N_D * Mu_n * q;// in (ohm-cm)^-1

+Rho_n = 1/Sigma_n;// in ohm-cm

+disp(Rho_n,"If a donor type impurity is added to the extent of 1 atom per 10^8 Ge atoms, then the resistivity drops in ohm-cm is");