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+// Exa 2.18
+clc;
+clear;
+close;
+// Given data
+miu_n= 0.13;// in m^2/Vs
+miu_p= 0.05;// in m^2/Vs
+q=1.6*10^-19;// in C
+ni=1.5*10^16;// per m^3
+sigma_intrinsic= q*ni*(miu_n+miu_p);// in (Ωm)^-1
+disp(sigma_intrinsic,"The conductivity of silicon in Intrinsic condition in (Ωm)^-1 is : ")
+
+// Part (b)
+n= 5*10^28/10^9;
+sigma= q*n*miu_n;// in (Ωm)^-1
+disp(sigma,"The conductivity with donar impurity in (Ωm)^-1 is : ")
+
+// Part (c)
+p= 5*10^28/10^8;
+sigma= q*p*miu_p;// in (Ωm)^-1
+disp(sigma,"The conductivity with acceptor impurity in (Ωm)^-1 is : ")
+
+// Part (d)
+p_desh= p-n;// in /m^3
+sigma= q*p_desh*miu_p;// in (Ωm)^-1
+disp(sigma,"The conductivity with donar and acceptor impurity in (Ωm)^-1 is : ")
+
+// Note : Answer in the book of part (a) may be miss printed or wrong