Physics - Modern Physics Question with Solution | TestHub

The energy of an electron in a hydrogen atom is given by $E_n=-\frac{13.6}{n^2}$ eV.

Absorption occurs when an electron transitions from a lower energy level to a higher energy level. The highest frequency corresponds to the largest energy difference.

Option A, $n=1$ to $n=2$, has the largest energy difference among the given options because it starts from the ground state ($n=1$). Therefore, it corresponds to the absorption line of the highest frequency.