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

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Comprehension \( \mathrm{X} \)
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 \( n=4 \).
In what region(s) of the spectrum does this series
occur? Visible region is from 360 to \( 780 \mathrm{~nm} \).
(a) Visible only.
(b) Infrared only.
(c) Visible and infrared.
(c) Visible and ultraviolet.
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