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// Example 7.5.1 page 7.24
clc;
clear;
h=6.626d-34; //plank's constant
c=3d8; //speed of light
e=1.6d-19; //charge of electron
q=1.43; //Bandgap energy
lamda=h*c/(q*e)*10^9; //computing wavelength
printf("\nWavelength is %d nm",lamda);
printf("\nThis proves that photodiode will not operate for photon of wavelength greater than %d nm.",lamda);
//answer in the book 868nm; deviation of 1nm
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