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+// chapter 9
+// example 9.11
+// Find the conductivity of p-type Ge crystal
+// page 276-277
+clear;
+clc;
+//given
+uh=1900; // in cm^2/V-s (mobility of electron)
+Na=2E17;// in /m^3 (acceptor doping concentration)
+e=1.6E-19; // in C(charge of electron)
+//calculate
+uh=uh*1E-4; // changing unit from cm^2/V-s to m^2/V-s
+Na=Na*1E6; // changing unit from 1/cm^3 to 1/m^3
+nh=Na; // hole concentration 
+// since sigma=ne*ue*e+nh*uh*e and nh>>ne
+// therefore sigma=nh*uh*e
+sigma=nh*uh*e; // calculation of conductivity
+printf('\nThe conductivity of p-type Ge crystal is \t%.f  /ohm-m',sigma);
+// Note: there is slight variation in the answer due to round off calculation