Question

The ratio of the longest to shortest wavelengths in Brackett series of hydrogen spectra is-

• A. $\frac{25}{9}$
• B. $\frac{17}{6}$
• C. $\frac{9}{5}$
• D. $\frac{4}{3}$

Answer 1

Answer: (A)

$\frac{25}{9}$

Answer 2

n₁ = 4

$\frac{1}{{\lambda_{\min}}^{2}\left( \frac{1}{4^{2}} - \frac{1}{\infty^{2}} \right)}$, $\frac{1}{{\lambda_{\max}}^{2}\left( \frac{1}{4^{2}} - \frac{1}{5^{2}} \right)}$s