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+// 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 
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