Question

The wavelength of an electron for transition from a state $n_1$ to $n_2$ is $\frac{ 9}{8R}$. Which of the following wavelengths is possible for a transition from $n_2$ to $n_1$.

• A. $\frac{16}{15R}$
• B. $\frac{4}{3R}$
• C. $\frac{9}{8R}$
• D. $\frac{36}{5R}$

Answer 1

Answer: (C)

$\frac{9}{8R}$

Answer 2

Energy released in transition from state $n_1$ to $n_2$ is equal to the energy absorbed in
transistion from state $n_2$ to $n_1$.