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+//Exa3.11
+clc;
+clear;
+close;
+// given data
+k_desh=1.38*10^-23;// in J degree^-1
+e=1.602*10^-19;// in C
+miu_e=3600;// in cm^2/V-s
+miu_h=1700;// in cm^2/V-s
+T=300;// in K
+D_e=miu_e*k_desh*T/e;
+disp("Diffusion constant of electrons is : "+string(D_e)+" cm^2/s");
+D_h=miu_h*k_desh*T/e;
+disp("Diffusion constant of holes is : "+string(D_h)+" cm^2/s");