Comprehension \( X \) In stars, the Pickering series is found in the \( \mathrm{He}^{+} \)spectr...

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Comprehension \( X \)
In stars, the Pickering series is found in the \( \mathrm{He}^{+} \)spectrum. It is emitted when the electron in \( \mathrm{He}^{+} \)jumps from higher levels to the level with \( n=4 \).
What is the wavelength of the series limit?
(a) \( 22.93 \mathrm{~nm} \)
(b) \( 366.97 \mathrm{~nm} \)
(c) \( 1019.36 \mathrm{~nm} \)
(d) \( 63.71 \mathrm{~nm} \)
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