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+//Chapter 12 : Semiconductor Physics
+
+clear;
+
+//Variable declaration
+Eg=0.8                 //Energy gap width
+T=300
+m=9.1*10**-31          //mass of electron
+k=1.38*10**-23
+h=6.63*10**-34         
+
+//Calculations
+ni=2*((2*22*m*k*T)/(7*h**2))**(3/2)*exp((-Eg*1.6*10**-19)/(2*k*T))/10**18
+
+//Result
+mprintf("Concentration of intrinsic charge= %.2f*10**18 /m**3",ni)
+ //The answer provided in the textbook is wrong
+