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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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+++ 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");