Question

What is the maximum wavelength line in the Lyman series of $H{e}^{+}$ion :-

• A. $3R$
• B. $\frac{1}{3R}$
• C. $\frac{4}{4R}$
• D. $R$

Answer 1

Answer: (B)

$\frac{1}{\lambda }=R.(2{)}^2\left(\frac{1}{1^2}-\frac{1}{2^2}\right)=3R$
$\lambda =\frac{1}{3R}$