Question

A hydrogen atom is bombarded with electrons accelerated through a potential difference of $V$, which causes excitation of hydrogen atoms. If the experiment is being performed at $T = 0 \, \text{K}$, the minimum potential difference needed to observe any Balmer series lines in the emission spectra will be$\frac{\alpha}{10} V,$where $\alpha = \, \underline{\hspace{2cm}}$.

Answer 1

The Correct Answer is