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Calculate the wavelength difference between the second lines in the visible regions of the hydrogen spectra...

Calculate the wavelength difference between the second lines in the visible regions of the hydrogen spectra of (Deuterium) and (Tritium) isotopes. (mass of deuterium and tritium nuclei is approximately 2 and 3 times the mass of hydrogen nuclei, respectively. mass of the hydrogen nucleus is also 1836 times mass of the electron)?

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