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// Ex7_13 Page:141 (2014)
clc;clear;
Z = 11; // Atomic number of sodium
h = 6.626e-034; // Planck's constant, Js
e = 1.6e-019; // Energy conversion factor, J/eV
c = 3e+08; // Speed of light in vacuum, m/s
R_inf = 1.097e+07; // Rydberg constant, per metre
E_K_alpha = (3*h*c*R_inf*(Z - 1)^2)/(4*e*1e+03); // The energy of the K_alpha X-ray of sodium, keV
printf("\nThe energy of the K_alpha X-ray of sodium = %4.2f keV", E_K_alpha);
// Result
// The energy of the K_alpha X-ray of sodium = 1.02 keV
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