MCQ
What is the maximum wavelength line in the lyman series of $He^+$ ion ?
- A$3R$
- ✓$\frac {1}{3R}$
- C$\frac {4}{4R}$
- DNone of these
✓
Answer
Correct option: B.
$\frac {1}{3R}$
b
$\frac{1}{\lambda_{\max }}=\mathrm{R} \times(2)^{2}\left(\frac{1}{1^{2}}-\frac{1}{2^{2}}\right)$
$\frac{1}{\lambda_{\max }}=\mathrm{R} \times(2)^{2}\left(\frac{1}{1^{2}}-\frac{1}{2^{2}}\right)$
$\lambda_{\max }=\frac{1}{3 \mathrm{R}}$
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