atomic structure and bohr atomic model questions with solutions

Showing 1–10 of 121 questions

• MCQeasyAtomic Structure and X-raysatomic structure and bohr atomic model

  Assuming Bohr's atomic model for hydrogen-like ions, the ground-state radius of Li²⁺ is a₀/X, where a₀ is the first Bohr radius. The value of X is:

  Options

  • Option A

    3

  • Option B

    1

  • Option C

    2

  • Option D

    9

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• NumericmediumAtomic Structure and X-raysatomic structure and bohr atomic model

  A hydrogen atom initially in its ground state absorbs a photon of energy 12.75 eV. The photon is exactly resonant with a bound-state excitation. If the electron reaches the Nth Bohr orbit, find N.

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• IntegermediumAtomic Structure and X-raysatomic structure and bohr atomic model

  If 917 Å is the lowest wavelength of the Lyman series, find the lowest wavelength of the Balmer series in Å.

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• NumericmediumAtomic Structure and X-raysatomic structure and bohr atomic model

  A hydrogen atom changes its state from n = 3 to n = 2. Due to recoil, the percentage change in the wave length of emitted light is approximately 1 × 10⁻ⁿ. The value of n is ________. [Given Rhc = 13.6 eV, hc = 1242 eV nm, h = 6.6 × 10⁻³⁴ J s, mass of the hydrogen atom = 1.6 × 10⁻²⁷ kg]

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• MCQmediumAtomic Structure and X-raysatomic structure and bohr atomic model

  A large collection of hydrogen atoms is initially excited to the fifth Bohr orbit and is then allowed to de-excite through all possible transitions. Which pair is closest to the maximum and minimum photon energies that can appear in the emitted spectrum?

  Options

  • Option A

    13.056 eV and 0.306 eV

  • Option B

    12.75 eV and 1.89 eV

  • Option C

    10.2 eV and 0.544 eV

  • Option D

    13.6 eV and 0 eV

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• MCQeasyAtomic Structure and X-raysatomic structure and bohr atomic model

  The ratio of the magnitude of the kinetic energy to the potential energy of an electron in the 5th excited state of a hydrogen atom is :

  Options

  • Option A

    4

  • Option B

    1/4

  • Option C

    1/2

  • Option D

    1

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• NumericeasyAtomic Structure and X-raysatomic structure and bohr atomic model

  According to Bohr's quantization rule, an electron is present in the fifth stationary orbit of a hydrogen-like atom. If its orbital angular momentum is Nħ, find N.

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• MCQmediumAtomic Structure and X-raysatomic structure and bohr atomic model

  A photon is emitted in transition from n = 4 to n=1 level in hydrogen atom. The corresponding wavelength for this transition is (given, h = 4 × 10⁻¹⁵ eVs) :

  Options

  • Option A

    94.1 nm

  • Option B

    941 nm

  • Option C

    97.4 nm

  • Option D

    99.3 nm

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• MCQeasyAtomic Structure and X-raysatomic structure and bohr atomic model

  According to Thomson's atomic model, which description of the atom is correct?

  Options

  • Option A

    The positive charge is concentrated at a point-like nucleus and electrons orbit outside it

  • Option B

    Positive charge is distributed throughout the atom and electrons are embedded within that positive distribution

  • Option C

    Electrons occupy only quantized circular orbits around a nucleus

  • Option D

    An atom contains electrons but no positive charge

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• NumericmediumAtomic Structure and X-raysatomic structure and bohr atomic model

  A large collection of hydrogen atoms is initially prepared in the fourth Bohr orbit and subsequently emits all possible photons while returning to lower levels. Take hc = 1240 eV·nm. If the minimum emitted wavelength is approximately N nm, find N to the nearest integer.

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