initial commit / add all books

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diff --git a/2129/CH1/EX1.21.4/ex1_21_4.sce b/2129/CH1/EX1.21.4/ex1_21_4.sce
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+// 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");