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clc//
//
//
//Variable declaration
e=1.6*10^-19; //charge(coulomb)
h=6.6*10^-34; //planck's constant(J sec)
c=3*10^8; //velocity of light(m/sec)
lamda=6943*10^-10; //wavelength(m)
k=8.61*10^-5;
T=300; //temperature(K)
//Calculation
dE=h*c/(e*lamda);
N2byN1=exp(-dE/(k*T)); //relative population
//Result
printf("\n relative population is %0.4f *10^-30",N2byN1*10^30)
printf("\n answer given in the book is wrong")
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