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//Example number 11.5, Page number 247
clc;clear;
close;
//Variable declaration
c=2.998*10**8; //velocity of light(m/s)
h=6.626*10**-34; //plank's constant(Js)
e=1.602*10**-19; //charge(coulomb)
Eg=1.43; //energy gap(eV)
//Calculation
lamda=h*c*10**6/(Eg*e); //wavelength(micro m)
//Result
printf("wavelength is %.2f micro-m",lamda)
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