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+//Example number 11.4, Page number 247
+
+clc;clear;
+close;
+
+//Variable declaration
+c=2.998*10**8;     //velocity of light(m/s)
+Kb=1.381*10**-23;    //boltzmann constant(J/K)
+T=1000;    //temperature(K)
+h=6.626*10**-34;    //plank's constant(Js)
+lamda=0.5*10**-6;   //wavelength(m)
+//Calculation
+v=c/lamda;    //frequency(Hz)
+BA=1/(exp(h*v/(Kb*T))-1);      //ratio of emission
+//Result
+printf("ratio of emission is %.1e",BA)
+//answer varies due to rounding off errors