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+clc;clear;
+//Example 18.7
+//calculation of hole concentration
+
+//given values
+ni=2.4*10^19;//carrier concentration per m^3
+N=4*10^28;//concentration of ge atoms per m^3
+
+//calculation
+ND=N/10^6;//donor cocntrtn
+n=ND;//no of electrones
+
+p=ni^2/n;
+disp(p,'concentartion of holes per m^3 is');
+\ No newline at end of file