Consider the spectral line resulting from the transition \( \mathrm{n}=2 \rightarrow \mathrm{n}=...

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Consider the spectral line resulting from the transition \( \mathrm{n}=2 \rightarrow \mathrm{n}=1 \) in the atoms and ions given below. The shortest wavelength is produced by:
\( P \)
(A) hydrogen atom
(B) deuterium atom
(C) singly ionized helium
(D) doubly ionized lithium
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