atomic structre and bohr atomic model questions with solutions

Showing 1–10 of 21 questions

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

  An electron makes transition A→C emitting wavelength 2000 Å and B→C emitting wavelength 6000 Å. The wavelength emitted in transition A→B is:

  Options

  • Option A

    3000 Å

  • Option B

    4000 Å

  • Option C

    8000 Å

  • Option D

    2000 Å

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

  For a hydrogen-like single-electron atom of atomic number Z, the frequency of revolution of the electron in the nth Bohr orbit is proportional to:

  Options

  • Option A

    Z/n²

  • Option B

    Z²/n³

  • Option C

    n³/Z

  • Option D

    Z/n

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

  In Rutherford's α-particle scattering experiment, only a very small fraction of incident α-particles rebound or undergo very large-angle scattering. Consider the following statements.

  A. The gold nucleus is extremely small compared with the size of the atom.
  B. An α-particle and a gold nucleus carry equal positive charge.
  C. Only a few α-particles have very small impact parameter.
  D. Only a few α-particles have exceptionally large kinetic energy. E. Only a few α-particles undergo nearly head-on collisions with nuclei.

  Which statements correctly explain the observation?

  Options

  • Option A

    A and B only

  • Option B

    B and E only

  • Option C

    C and D only

  • Option D

    A, C and E only

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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.

  Your answer

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

  Given below are two statements : Statement I : Most of the mass of the atom and all its positive charge are concentrated in a tiny nucleus and the electrons revolve around it, is Rutherford’s model. Statement II : An atom is a spherical cloud of positive charges with electrons embedded in it, is a special case of Rutherford’s model. In the light of the above statements, choose the most appropriate from the options given below.

  Options

  • Option A

    Both statement I and statement II are false

  • Option B

    Statement I is false but statement II is true

  • Option C

    Statement I is true but statement II is false

  • Option D

    Both statement I and statement II are true

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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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• 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

  For hydrogen, the ratio of the largest wavelength in the Lyman series to the largest wavelength in the Balmer series is:

  Options

  • Option A

    5:36

  • Option B

    5:27

  • Option C

    3:4

  • Option D

    27:5

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