\textbf{198.} In a hydrogen atom, an electron transitions from level $n$ to level $n'$ and emits light with frequency $562.5\ \text{THz}$. $n$ and $n'$ are respectively which values?
$$\left(c = 3\times10^{8}\ \frac{\text{m}}{\text{s}},\ R_H = 0.01\ \text{nm}^{-1}\right)$$
\hspace{2cm}(1) 2 and 1 \hspace{1.5cm} (2) 3 and 1 \hspace{1.5cm} (3) 4 and 2 \hspace{1.5cm} (4) 5 and 3