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+//Chapter 12 : Semiconductor Physics
+
+clear;
+
+//Variable declaration
+myun=0.39              //mobility of electrons 
+myup=0.21              //mobility of holes
+ni=2.5*10**19          //intrinsic concentration 
+e=1.6*10**-19  
+
+//Calculations
+sigmai=ni*e*(myun+myup) //conductivity of intrinsic semiconductor
+rhoi=1/sigmai
+
+//Result
+mprintf("Conductivity = %.1f ohm**-1-m**-1",sigmai)
+mprintf("\nResistivity= %.2f ohm-m",rhoi)
+//The answer provided in the textbook is wrong
+