Hydrogen atom bombarded electron accelerate | MODERN PHYSICS

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Hydrogen atom is bombarded with electrons accelerated through a potential different of $V$, which causes excitation of hydrogen atoms. If the experiment is being formed at $\mathrm{T}=0 \mathrm{~K}$. The minimum potential difference needed to observe any Balmer series lines in the emission spectra will be $\frac{\alpha}{10} \mathrm{~V}$, where $\alpha=\quad$

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