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clear
//
//
//
//Variable declaration
c=3*10**8 //velocity of light(m/sec)
e=1.6*10**-19 //charge of electron(coulomb)
lamda=6943*10**-10 //wavelength(m)
h=6.6*10**-34 //planck's constant(Jsec)
kb=1.38*10**-23 //boltzmann constant
T=300 //temperature(K)
//Calculation
Uv=h*c/(e*lamda) //energy(eV)
Uvj=Uv*e //energy(J)
x=Uvj/(kb*T)
NbyN0=exp(x) //relative population of 2 states
//Result
printf("\n relative population of 2 states is %0.0f *10**29",NbyN0*10**-29)
printf("\n answer given in the book is wrong")
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