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+// chapter 2 , Example2 1 , pg 52
+lam=590*10^-9//wavelength(in m)
+T=250+273  //temperature(in kelvin)   (converting celsius into kelvin)
+k=1.38*10^-23//boltzman constant (in (m^2*Kg)/(s^2*k))
+h=6.625*10^-34//plancks constant(in Js)
+c=3*10^8//speed of light
+N=exp(-(h*c)/(lam*k*T)) //N=(n2/n1)=relative population of atoms in the 1st excited state  and in ground state
+//n1=number of atoms in ground state
+//n2=number of atoms in excited state
+printf("Relative population of Na atoms in the 1st excited state and in ground state\n")
+disp(N)