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+// Example no.3.8
+// To find the wavelength of the light emitted
+// Page no.133
+
+clc;
+clear;
+
+// Given data
+RspRst=2*10^14;                                           // The ratio of spontaneous emission rate to stimulated emission rate
+T=30;                                                     // Temperature in degree celcius
+kB=1.38*10^(-23);                                         // The Boltzmann’s constant J/K
+h=1.054*10^(-34);                                         // The distance between two levels
+c=3*10^8;                                                 // Speed of ligth in air
+
+T=T+273;                                                  // Temperature in Kelvin
+w=(log(RspRst)*kB*T)/h;                                   // Frequency in Rad
+
+// The wavelength of the light emitted
+lambda=(2*%pi*c)/w;                                      // The wavelength of the light emitted
+
+// Displaying the result in command window
+printf('\n The wavelength of the light emitted =  %0.2f micrometer',lambda*10^6);