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Minimum energy (or accelerating voltage) needed for hydrogen in the ground state to emit Balmer lines

The same question, asked 2 times: 29 Jan 2024, 1 Feb 2024. Every wording below, oldest first.

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  1. Question 1

    29 Jan 2024

    113
    Hydrogen atom is bombarded with electrons accelerated through a potential difference of VV, which causes excitation of hydrogen atoms. If the experiment is performed at T=0 KT = 0\text{ }K. The minimum potential difference needed to observe any Balmer series lines in the emission spectra will be α10 V\frac{\alpha}{10}\text{ }V, where α=\alpha= ______

  2. Question 2

    1 Feb 2024

    19
    The minimum energy required by a hydrogen atom in ground state to emit radiation in Balmer series is nearly:

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