Question

The minimum wavelength for Balmer series is ______

• A. $\frac{9}{R}$
• B. $\frac{4}{R}$
• C. $\frac{36}{5R}$
• D. $\frac{R}{4}$

Answer 1

Answer: (B)

$\frac{1}{\gamma }=R\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)=R\left(\frac{1}{2^2}-\frac{1}{{\infty }^2}\right)$