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+// chapter 9
+// example 9.12
+// Find the diffusion co-efficient of electron in silicon
+// page 277
+clear;
+clc;
+//given
+ue=0.19; // in m^2/V-s (mobility of electron)
+T=300; // in K (temperature)
+k=1.38E-23; // in J/K (Boltzmann’s constant)
+e=1.6E-19; // in C(charge of electron)
+//calculate
+Dn=ue*k*T/e; // calculation of diffusion co-efficient
+printf('\nThe diffusion co-efficient of electron in silicon is \tDn=%1.1E m^2/s',Dn);