1 files changed, 16 insertions, 0 deletions
diff --git a/2258/CH7/EX7.25/7_25.sce b/2258/CH7/EX7.25/7_25.sce
new file mode 100755
index 000000000..e08c114a7
--- /dev/null
+++ b/2258/CH7/EX7.25/7_25.sce
@@ -0,0 +1,16 @@
+clc();
+clear;
+// To calculate the resistivity of doped Ge
+ni=2.5*10^19;   //density of charge carriers in m^3
+r=1/(10^6);    //ratio
+e=1.6*10^-19;
+mew_e=0.36;   //mobility of electrons in m^2/Vs
+mew_h=0.18;   //mobility of holes in m^2/Vs
+N=4.2*10^28;    //number of Si atoms per m^3
+Ne=r*N;
+printf("number of impurity atoms per m^3 is");
+disp(Ne);
+Nh=(ni^2)/Ne;
+sigma=(Ne*e*mew_e)+(Nh*e*mew_h);
+rho=1/sigma;
+printf("the resistivity of doped Ge is %f ohm m",rho);