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Number of spectral lines emitted by hydrogen excited to a given level or by a given energy

This type of question, asked 6 times: 2021 Paper 21, 11 Apr 2023, 12 Apr 2023, 30 Jan 2024, 9 Apr 2024, 29 Jan 2025. All 6 questions below, oldest first.

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  1. Question 1

    2021 Paper 21

    23
    X different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are excited to states with principal quantum number n=6n = 6 ? The value of XX is

  2. Question 2

    11 Apr 2023

    21
    A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit radiation of six different wavelengths. The frequency of incident light is x×1015 Hzx \times10^{15}\text{ }Hz. The value of xx is ____. (Given  h=4.25×10−15eVs)\left. \ h = 4.25 \times10^{- 15}eVs \right)

  3. Question 3

    12 Apr 2023

    18
    A 12.5eV12.5eV electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be:

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  4. Question 4

    30 Jan 2024

    23
    An electron of a hydrogen atom in an excited state has energy En=−0.85eVE_{n}= - 0.85eV. The maximum number of allowed transitions to lower energy level is ............

  5. Question 5

    9 Apr 2024

    94
    A hydrogen atom in ground state is given an energy of 10.2eV10.2eV. How many spectral lines will be emitted due to transition of electrons?

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  6. Question 6

    29 Jan 2025

    95
    The number of spectral lines emitted by atomic hydrogen that is in the 4th 4^{\text{th~}} energy level, is

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