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// Scilab Code Ex8.5:: Page-8.9 (2009)
clc; clear;
lambda = 7000; // Wavelength of the emitted light, angstrom
k = 8.6e-005; // Boltzmann constant, eV/K
dE = 12400/lambda; // Energy difference of the levels, eV
T = 27+273; // Temperatures of the state, K
N2_ratio_N1 = exp(-(dE/(k*T))); // Relative population
printf("\nThe relative population of two states in He-Ne laser at %d K = %3.1e", T, N2_ratio_N1);
// Result
// The relative population of two states in He-Ne laser at 300 K = 1.5e-30
// The answer is given wrong in the textbook
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