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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)