What is the frequency of the second line of the P Paschen series in...

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What is the frequency of the second line of the
P Paschen series in the spectrum of \( \mathrm{He}^{+} \)ion?

W
(A) \( \frac{64 \text { R.C }}{225} \)
(B) \( \frac{64 \mathrm{R}}{225} \)
(C) \( \frac{225}{64 \mathrm{R}} \)
(D) \( \frac{225 \mathrm{C}}{64 \mathrm{R}} \)
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