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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