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+//Example 4.2, Page number 4.32
+
+clc;clear;close
+
+// variable declaration
+C=3*10**8                    // The speed of light
+Lamda=6943                   // Wavelength
+T=300                        // Temperature in Kelvin
+h=6.626*10**-34              // Planck constant 
+k=1.38*10**-23               // Boltzmann's constant
+
+// Calculations
+
+V=(C)/(Lamda*10**-10)       // Frequency
+R=exp(h*V/(k*T))       // Relative population
+
+// Result
+printf("Frequency (V) = %0.2e Hz",V)
+printf("\nRelative Population = %.3e",R)