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The energy of stable states of the hydro...

The energy of stable states of the hydrogen atom is given by `E_(n)=-2.18xx10^(-8)//n^(2)[J]` where n denotes the principal quantum number.
In what spectral range is the Lyman series lying?

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The correct Answer is:
The Lyman series is due to `DeltaE_(n rarr 1)` varying from `1.635xx10^(-18) J (n=1)` to `2.135xx10^(-18) J (n rarr oo)`, which corresponds to `121.5 nm` and to `93.0 nm`, respectively. This is in the UV-region.
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