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diff --git a/339/CH6/EX6.1/ex6_1.sce b/339/CH6/EX6.1/ex6_1.sce
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+//define physical constants
+q=1.60218e-19;
+k=1.38066e-23;
+
+// define material properties
+Nc_300=[1.04e19 2.8e19  4.7e17];
+Nv_300=[6e18    1.04e19 7e18];
+mu_n=  [3900    1500    8500];
+mu_p=  [1900    450     400];
+Wg=    [0.66    1.12    1.424];
+
+T0=273;
+T=-50:250; // temperature range in centigrade
+
+sigma=zeros([3 length(T)]);
+
+for s=1:3 //loop through all semi conductor materials
+   Nc=Nc_300(s)*((T+T0)/300).^(3/2);
+   Nv=Nv_300(s)*((T+T0)/300).^(3/2);
+sigma=[q*sqrt(Nc.*Nv).*(exp(-Wg(s)./(2*k*(T+T0)/q)))*(mu_n(s)+mu_p(s))];
+end;
+
+plot(T,sigma(1),T,sigma(2),T,sigma(3));
+legend('Ge','Si','GaAs',2);
+title('Conductivity of semiconductor at different temperatures');
+xlabel('Temperature, {\circ}C');
+ylabel('Conductivity \sigma, \Omega^{-1}cm^{-1}');
+\ No newline at end of file