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Photon from a hydrogen transition falls on a metal: stopping potential or the level n

This type of question, asked 2 times: 25 Apr 2025 S1, 20 Apr 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    25 Apr 2025 S1

    9
    If the electron in hydrogen atom jumps from third Bohr orbit to ground state directly and the difference between energies of the two states is radiated in the form of photons. If the work function of the material is 4.1 eV , then stopping potential is nearly [Energy of electron in nth n^{\text{th~}} orbit =−13⋅6n2eV=\frac{- 13 \cdot 6}{n^{2}}eV ]

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  2. Question 2

    20 Apr 2026 S1

    146
    An electron in the hydrogen atom jumps from nthn^{th} energy state to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.652.65 eV. If the maximum kinetic energy of the emitted photoelectrons is 10.110.1 eV, then the value of 'nn' is

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