atomic structre and bohr atomic model questions with solutions

Showing 1–10 of 22 questions

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

  Consider the statements: S1: The dimensions of Planck's constant and angular momentum are the same. S2: In Bohr's model, an electron revolves only in those orbits for which its angular momentum is an integral multiple of Planck's constant h. Choose the correct answer.

  Options

  • Option A

    S1 is incorrect but S2 is correct

  • Option B

    Both S1 and S2 are incorrect

  • Option C

    S1 is correct but S2 is incorrect

  • Option D

    Both S1 and S2 are correct

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

  In an alpha particle scattering experiment distance of closest approach for the α particle is 4.5 × 10⁻¹⁴ m. If target nucleus has atomic number 80, then maximum velocity of α-particle is _______ × 10⁵ m/s approximately. (1/(4πε₀) = 9 × 10⁹ SI unit, mass of α particle = 6.72 × 10⁻²⁷ kg)

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

  If the radius of the first Bohr orbit of hydrogen is a₀, the radius of the second Bohr orbit is:

  Options

  • Option A

    8a₀

  • Option B

    4a₀

  • Option C

    2a₀

  • Option D

    6πa₀

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

  The radius of the electron orbit in the ground state of hydrogen is a₀. The radius of the electron orbit in He⁺ in the third excited state is a. Find a in terms of a₀.

  Options

  • Option A

    a₀/8

  • Option B

    2a₀

  • Option C

    4a₀

  • Option D

    8a₀

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

  Considering Bohr's atomic model: (A) the energy of H atom in ground state is the same as the energy of He⁺ ion in its first excited state; (B) the energy of H atom in ground state is the same as that of Li²⁺ ion in its second excited state; (C) the energy of H atom in ground state is the same as that of He⁺ ion in its ground state; (D) the energy of He⁺ ion in its first excited state is the same as that of Li²⁺ ion in its ground state. Choose the correct answer.

  Options

  • Option A

    (A), (C) only

  • Option B

    (A), (D) only

  • Option C

    (A), (B) only

  • Option D

    (B), (D) only

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

  In a hydrogen-like ion, the energy difference between the second excited state and the ground state is 108.8 eV. The atomic number of the ion is:

  Options

  • Option A

    4

  • Option B

    2

  • Option C

    1

  • Option D

    3

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

  Given below are an Assertion (A) and a Reason (R). Assertion (A): The Bohr model is applicable to hydrogen and hydrogen-like atoms only. Reason (R): The formulation of the Bohr model does not include repulsive force between electrons. Choose the correct answer.

  Options

  • Option A

    Both A and R are true but R is NOT the correct explanation of A

  • Option B

    Both A and R are true and R is the correct explanation of A

  • Option C

    A is true but R is false

  • Option D

    A is false but R is true

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

  Using the Bohr model, let B₂ and B₄ be the magnetic fields at the nucleus produced by the orbital motion of the electron in the second and fourth Bohr orbits of a hydrogen atom, respectively. Find B₂ ÷ B₄.

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

  Using the Bohr model for hydrogen-like atoms, the ratio of the radius of the 5th orbit in Li²⁺ to that in He⁺ is:

  Options

  • Option A

    4/9

  • Option B

    3/2

  • Option C

    9/4

  • Option D

    2/3

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