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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
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