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+//Example 14.11 // no. of defects
+clc;
+clear;
+//given data :
+k=8.625D-5;// Boltzmann constant eV/k
+E=1.4;// energy to create defect in eV
+T1=293;// temperature in kelvin
+T2=573;// temperature in kelvin
+ratio=exp((-E/k)*(1/(2*T1)-1/(2*T2)));// ratio of no. of defects at T1 & T2
+format('e',10);ratio;
+disp(ratio, "ratio of number of Frenkel defect")
+ratio=1/ratio;//
+disp(ratio,"it can be written as")