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// Example no.5.2
// To calculate (a) the responsivity R and (b) the cutoff wavelength
// Page no.198
clc;
clear;
// Given data
neta=0.9; // The quantum efficiency
Eg=1.42; // The band-gap energy in eV
lambda=1.1; // The operating (free-space) wavelength in micrometer
// (a) The responsivity
R=(neta*lambda)/1.24; // The responsivity in A/W
// Display result on command window
printf('\n The responsivity = %0.1f A/W',R) //Wrong answer in book
// (b) The cutoff wavelength
lambdac=1.2/Eg; //The cutoff wavelength in micrometer
// Display result on command window
printf('\n The cutoff wavelength = %0.3f micrometer',lambdac) //Wrong answer in book
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