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+// Example 6.21.1  page 6.59
+
+clc;
+clear;
+
+tr=50;      //radiative recombination lifetime
+tnr=85;     //non-radiative recombination lifetime
+h=6.624d-34;  //plank's constant
+c=3d8;      //speed of light
+q=1.6d-19;  //charge of electron
+i=35d-3;    //current
+lamda=0.85d-6;      //wavelength
+
+t=tr*tnr/(tr+tnr);          //computing total recombination time
+eta=t/tr;                   //computing internal quantum efficiency
+Pint=eta*h*c*i/(q*lamda);   //computing internally generated power
+Pint=Pint*10^3
+
+printf("\nTotal recombinaiton time is %.2f ns.\nInternal quantum efficiency is %.3f.\nInternally generated power is %.1f mW.",t,eta,Pint);
+
+//answer in the book for Internal quantum efficiency is 0.629, deviation of 0.001.
+//answer in the book for Internally generated power is 32.16 mW, deviation of 0.04 mW.