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diff --git a/1223/CH1/EX1.2/Ex1_2.sce b/1223/CH1/EX1.2/Ex1_2.sce
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+clear;
+clc;
+//Example 1.2 
+T=300;//(°K)Given Temperature
+Nd=10^16;//(cm^-3)Donor concentration
+n_i=1.5*10^10;//(cm^-3)intrinsic carrier concentration
+//since Nd>>n_i
+n_o=10^16;//(cm^-3)electron concentration
+//by using formula ::n_i^2=n_o*p_o
+p_o=(n_i)^2/Nd;//hole concentration
+printf('\nelectron concentration= %.e cm^-3',n_o);
+printf('\nhole concentration =%e cm^-3',p_o);