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+//Example 4.4, Page number 4.33
+
+clc;clear;close
+
+// variable declaration
+h=6.626*10**-34              // Planck constant 
+C=3*10**8                    // Velocity of light
+E_g=1.44                     // bandgap 
+
+// calculations
+lamda=(h*C)*10**10/(E_g*1.6*10**-19)       // Wavelenght
+
+// Result
+printf("Wavelength = %.f Angstrom",(lamda))