Atomic Structure & Bohr's Atomic Model questions with solutions

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• MCQeasyAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  The radius of innermost orbit of hydrogen atom is 5.3 × 10⁻¹¹ m. What is the radius of third allowed orbit of hydrogen atom?

  Options

  • Option A

    1.59 Å

  • Option B

    4.77 Å

  • Option C

    0.53 Å

  • Option D

    1.06 Å

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• MCQeasyAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  The spectral series for electronic transitions from n₂ = 5, 6, … to the level n₁ = 4 is:

  Options

  • Option A

    Pfund series

  • Option B

    Brackett series

  • Option C

    Lyman series

  • Option D

    Balmer series

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• NumericmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  The radius of the fifth orbit of Li²⁺ is ______ × 10⁻¹² m. Take radius of hydrogen atom = 0.51 Å.

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• MCQeasyAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  According to Bohr's theory, the moment of momentum of an electron revolving in 4th orbit of hydrogen atom is:

  Options

  • Option A

    h/(8π)

  • Option B

    h/π

  • Option C

    2h/π

  • Option D

    h/(2π)

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• NumericmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  A single hydrogen atom is initially prepared in the sixth Bohr orbit. It eventually reaches the ground state and is allowed to pass through intermediate stationary states. Find the maximum possible number of photons emitted by this one atom before it reaches the ground state.

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• NumericmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  A hydrogen atom makes the transition n=3→1. The emitted photons fall on a material of work function 5.1 eV. Estimate the stopping potential in volts.

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• MCQmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  In hydrogen atom spectrum, (R → Rydberg's constant)

  A. the maximum wavelength of the radiation of Lyman series is 4/(3R)

  B. the Balmer series lies in the visible region of the spectrum

  C. the minimum wavelength of the radiation of Paschen series is 9/R

  D. the minimum wavelength of Lyman series is 5/(4R)

  Choose the correct answer from the options given below :

  Options

  • Option A

    B, D Only

  • Option B

    A, B and C Only

  • Option C

    A, B and D Only

  • Option D

    A, B Only

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• NumericmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  Hydrogen atoms in the ground state are excited by monochromatic radiation of wavelength 975 Å. Find the number of spectral lines in the resulting emission spectrum.

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• MCQeasyAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  Statement I: Atoms are electrically neutral as they contain equal numbers of positive and negative charges. Statement II: Atoms of each element are stable and emit their characteristic spectrum. Choose the correct statement(s):

  Options

  • Option A

    Both I and II are incorrect

  • Option B

    I correct, II incorrect

  • Option C

    I incorrect, II correct

  • Option D

    Both I and II correct

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• MCQmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  The ionization energy of hydrogen in its ground state is 13.6 eV. Atoms are excited to higher levels to emit radiations of six wavelengths. Maximum wavelength corresponds to:

  Options

  • Option A

    n = 3 → n = 2

  • Option B

    n = 3 → n = 1

  • Option C

    n = 2 → n = 1

  • Option D

    n = 4 → n = 3

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  AIPMT Screening 2009NEET Previous Year

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