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+// Example 5.28 
+// Computation of  cut off wavelength
+// Page no 488
+
+clc;
+clear;
+close;
+
+// Given data
+h=6.626*10^-34;          // Planck constant.
+c=3*10^8;                // Speed of light
+Eg= 1.43*1.602*10^-19;   // Bandgap energy
+
+// Cut off wavelength 
+lambda= h*c/Eg; 
+
+//Display result on command window
+printf("\n Cut off wavelength (micrometer) = %0.3f  ",lambda*10^6);