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+//Example number 9.7, Page number 205
+
+clc;clear;
+close;
+
+//Variable declaration
+e=1.6*10**-19;     //charge(c)
+mew_e=0.19;        //electron mobility(m**2/Vs)
+T=300;         //temperature(K)
+KB=1.38*10**-23;   //boltzmann constant
+//Calculation
+Dn=mew_e*KB*T/e;    //diffusion coefficient(m**2/sec)
+//Result
+printf("diffusion coefficient is %.1e m^2/s",Dn)