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clear
//
//
//
//Variable declaration
c=2.998*10**8 //velocity of light(m/sec)
lamda=0.5*10**-9 //wavelength(m)
h=6.626*10**-34 //planck's constant(Jsec)
Kb=1.381*10**-23 //boltzmann constant
T=1000 //temperature(K)
//Calculation
new=c/lamda //operating frequency(Hz)
new=new/10**3 //operating frequency(kHz)
new=(new/10**14)*10**14
x=h*new/(Kb*T)
B21byA21=1/(exp(x)-1) //ratio of emission
//Result
printf("\n ratio of emission is %0.1f *10**-13",B21byA21*10**13)
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