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+clc;
+clear all;
+ue=3900;//electon mobility in cm^2/V*s
+uh=1900;//hole mobility in cm^2/V*s
+ni=2.15e13;//intrisic carrier concentration in cm^-3
+e=1.6e-19;//charge of electron
+sigma=ni*e*(ue+uh);//conductivity of germanium
+disp('ohm^-1 cm^-1',sigma,'conductivity of semiconductor is:')
+rho=1/sigma;
+disp('ohm cm',rho,'ressistivity of semiconductor is')
+//Slight variation in answer than book.. there is mistake in book.. checked in calculator also..