Question

The ratio of the frequencies of the longest wavelength limits of the Lyman and Balmer series of hydrogen is respectively:

• A. 27:5
• B. 5:27
• C. 4:1
• D. 1:4

Answer 1

The correct option is B 5:27

${\lambda }_{long}$ for Lyman $=\frac{4}{3R}$
${\lambda }_{long}$ for Balmer $=\frac{36}{5R}$