initial commit / add all books

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+// Exa 3.21.4

+clc;

+clear;

+close;

+format('e',9)

+// Given data

+K = 1.38 * 10^-23;// in J/K

+T = 27;// in degree

+T = T + 273;// in K

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

+Mu_e = 0.17;// in m^2/v-s

+Mu_e1 = 0.025;// in m^2/v-s

+D_n = ((K * T)/e) * Mu_e;// in m^2/s

+disp(D_n,"The diffusion coefficient of electrons in m^2/s is");

+D_p = ((K * T)/e) * Mu_e1;// in m^2/s

+disp(D_p,"The diffusion coefficient of  holes in m^2/s is ");