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+//Example number 11.2, Page number 246
+
+clc;clear;
+close;
+
+//Variable declaration
+e=1.6*10**-19; //charge(coulomb)
+c=3*10**10; //velocity of light(m/s)
+h=6.6*10**-34; //plank's constant(Js)
+Eg=3; //energy gap(eV)
+//Calculation
+lamda=h*c*10**9/(Eg*e); //wavelength of photon(nm)
+//Result
+printf("wavelength of photon is %.f nm",lamda)
+//answer given in the book is wrong