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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.
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