// Scilab Code Ex2.26 Difference in wavelength in the spectra of hydrogen and deuterium: Pg:62 (2008) R_H = 1.097e+07; // Rydberg constant for H-atom, per metre M_H = 1; // Mass of H-atom, amu M_D = 2*M_H; // Mass of D-atom, amu m = 0.000549*M_H; // Mass of an electron, amu R_D = R_H*(1+m/M_H)/(1+m/M_D); // Rydberg constant for D-atom, per metre n1 = 2, n2 = 3; // Principal qunatum numbers for first line of Balmer series L_H = 1/(R_H*(1/n1^2 - 1/n2^2)); // Wavelength of H-atom, m L_D = 1/(R_D*(1/n1^2 - 1/n2^2)); // Wavelength of D-atom, m delta_H = (L_H - L_D)/1e-010; // Difference in wavelength in the spectra of hydrogen and deuterium, angstrom printf("\nThe difference in wavelength in the spectra of hydrogen and deuterium = %3.1f angstrom", delta_H); // Result // The difference in wavelength in the spectra of hydrogen and deuterium = 1.8 angstrom