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The first four spectral lines in the Lyman serics of a H-atom are λ = 1218 Å, 1028Å, 974.3 Å and 951.4Å. If instead of Hydrogen, we consider Deuterium, calculate the shift in the wavelength of these lines.

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Reduced mass for

Reduced mass for

If for Hydrogen/Deuterium the wavelength is λH /λD

Thus lines are 1217.7 Å , 1027.7 Å, 974.04 Å, 951.143 Å.

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