Question

The ratio of highest possible wavelength to lowest possible wavelength of Lyman series is

• A. $4/3$
• B. $9/8$
• C. $27/5$
• D. $16/5$

Answer 1

Answer: (A)

$\frac{1}{{\lambda }_1}=R\left[\frac{1}{1}-\frac{1}{\infty }\right]=R$

$\frac{1}{{\lambda }_2}=R\left[\frac{1}{1}-\frac{1}{4}\right]=\frac{3R}{4}$

$\frac{{\lambda }_1}{{\lambda }_2}=\frac{4}{3}$