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+clear//
+
+//Variables
+
+p = 0.47 //Resistivity (in ohm-meter)
+q = 1.6 * 10**-19 //charge on electron (in Coulomb)
+un = 0.39 //mobility of electron in germanium (in m**2 per volt-second)
+up = 0.19 //mobility of hole in germanium (in m**2 per volt-second)
+
+//Calculation
+
+sig = 1/p //Conductivity (in siemen per meter)
+ni = sig / (q *(un +up)) //intrinsic concentration (in per cubic-meter)
+
+//Result
+
+printf("\n Intrinsic concentration is %0.3f m**-3.",ni)