1. Tardigrade
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  4. In which of the following series, does the 121.5 nm line of the spectrum of the hydrogen atom lie?

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Q. In which of the following series, does the $121.5\, nm$ line of the spectrum of the hydrogen atom lie?

Atoms

Solution:

Since $121.5\, nm$ line of spectrum of hydrogen atom lies in ultraviolet region, therefore it is Lyman series.