Atoms and Nuclei: Rutherford and Bohr Models
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Questions and Answers

What is the expression for the orbital velocity of an electron in Bohr's model of the hydrogen atom?

  • $v = \dfrac{1}{4\pi\epsilon_0}\dfrac{Ze^2}{n\hbar}$ (correct)
  • $v = \dfrac{1}{\pi\epsilon_0}\dfrac{Ze^2}{n\hbar}$
  • $v = \dfrac{1}{8\pi\epsilon_0}\dfrac{Ze^2}{n\hbar}$
  • $v = \dfrac{1}{2\pi\epsilon_0}\dfrac{Ze^2}{n\hbar}$

    • According to Bohr's model of the hydrogen atom, what provides the necessary centripetal force required for the electron?

  • Magnetic force between the nucleus and the electron
  • Electrostatic force of attraction between the nucleus and the electron (correct)
  • Gravitational force between the nucleus and the electron
  • Weak nuclear force between the nucleus and the electron

    • What is the condition for permitted orbits in Bohr's model of the hydrogen atom?

  • $mvr = n^2h/2\pi$
  • $mvr = nh/4\pi$
  • $mvr = nh/2\pi$ (correct)
  • $mvr = n^2h/4\pi$

    • What are the circular orbits called in Bohr's model of the hydrogen atom?

    <p>Stationary orbits</p> Signup and view all the answers

    According to Bohr's model, what are non-radiating orbits?

    <p>Orbits in which an electron does not radiate energy while revolving</p> Signup and view all the answers

    Define the power of accommodation of the eye.

    <p>The ability of the eye to change the focal length of the eye lens by adjusting the curvature of the lens for viewing near and far objects is called the power of accommodation.</p> Signup and view all the answers

    What is the near point and what is its significance for a normal eye?

    <p>The nearest point upto which an object can be seen clearly is called the near point. The distance of this point from the eye is called the least distance of distinct vision. For a normal eye, the near point is at a distance of 25cm.</p> Signup and view all the answers

    Explain the concept of the far point for a normal eye.

    <p>The farthest point upto which objects can be clearly seen is called the far point. For a normal eye, the far point is at infinity.</p> Signup and view all the answers

    What is a microscope and how is it defined?

    <p>An instrument which forms a magnified image of a small object placed close to the eye is called a microscope.</p> Signup and view all the answers

    What is the magnifying power (angular magnification) of a lens?

    <p>Magnifying power(M) is the ratio of the angle subtended at the eye by the image at the near point, to the angle subtended at an unaided eye by the object, at least distance of distinct vision.</p> Signup and view all the answers

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