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+//Example 15.6//
+
+a=1.107;//eV //conduction band in silicon
+b=2;//eV//electron volt //Given
+E=a/b
+mprintf("E = %f eV",E)
+k=86.2*10^-6;//eVk^-1 //Boltzmann's constant
+T=298;//k //kelvin //Temperature
+c=(%e^(E/(k*T)))+1
+//mprintf("c = %e ",c)
+fE=1/c
+mprintf("\nfE = %e ",fE)