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+// Example 7.5.3  page 7.24
+
+clc;
+clear;
+
+lamda1=1300d-9;
+lamda2=1600d-9;
+h=6.625d-34;    //plank's constant
+c=3d8;      //speed of light
+q=1.6d-19;  //charge of electron
+eta=90/100; //quantum efficiency
+E=0.73;      //energy gap in eV
+R1=eta*q*lamda1/(h*c);
+R2=eta*q*lamda2/(h*c);
+lamdac=1.24/E;
+
+printf("\nResponsivity at 1300nm is %.2f A/W.\nResponsivity at 1600nm is %.2f A/W.\nCut-off wavelength is %.1f micrometer.",R1,R2,lamdac);
+
+//R1 is calculated as 0.92 in the book, deviation of 0.02.