Which transition in \( \mathrm{Li}^{2+} \) would have the same wavelength as the \( 2 \rightarro...

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Which transition in \( \mathrm{Li}^{2+} \) would have the same wavelength as the \( 2 \rightarrow 4 \) transition in \( \mathrm{He}^{+} \)ion?
(a) \( 4 \rightarrow 2 \)
(b) \( 2 \rightarrow 4 \)
(c) \( 3 \rightarrow 6 \)
(d) \( 6 \rightarrow 2 \)
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