Quantum Physics

10 Questions | Total Attempts: 1201

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Quantum Physics

IB Physics


Questions and Answers
  • 1. 
    When light is incident on a metal surface, electrons may be ejected. The following graph shows the variation with frequency f of the maximum kinetic energy Ek  max of the ejected electrons Which one of the following graphs best shows the variation with frequency f of the maximum kinetic energy Ek  max of the ejected electrons if another metal surface with a lower threshold frequency is used?
    • A. 
    • B. 
    • C. 
    • D. 
  • 2. 
    When electrons of suitable energy travel through a thin layer of graphite, a pattern of concentric circles is produced on a screen. The production of this pattern is evidence for
    • A. 

      The wave nature of the electron

    • B. 

      The nuclear model of the atom.

    • C. 

      The particle nature of the electron.

    • D. 

      The existence of X-rays

  • 3. 
    The graph shows the variation with frequency f of the maximum kinetic energy Ek of photoelectrons emitted from a metal surface S. Which one of the following graphs shows the corresponding variation for a metal surface with a higher work function? The dotted line on each graph shows the variation for metal S.
    • A. 
    • B. 
    • C. 
    • D. 
  • 4. 
    An α-particle having a de Broglie wavelength λi collides with a stationary carbon nucleus. The α-particle moves off in a different direction as shown below. After the collision, the de Broglie wavelengths of the α-particle and the carbon nucleus are λf and λc respectively. Which of the following is a true statement related to the de Broglie wavelengths?
    • A. 

      λi < λf

    • B. 

      λi > λf

    • C. 

      λf = λc

    • D. 

      λi = λc

  • 5. 
    Which one of the following best shows the variation with kinetic energy E of the de Broglie wavelength λ associated with a particle?
    • A. 
    • B. 
    • C. 
    • D. 
  • 6. 
    An electron is accelerated from rest through a potential difference V. Which one of the following best shows the variation of the de Broglie wavelength l of the electron with potential difference V?
    • A. 
    • B. 
    • C. 
    • D. 
  • 7. 
    The diagram below shows some possible electron transitions between three principal energy levels in the hydrogen atom. Which electron transition is associated with the absorption of a photon of the longest wavelength?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 8. 
    The diagram below shows three energy levels of a certain atom.
    • A. 

      1/3

    • B. 

      1/2

    • C. 

      2

    • D. 

      3

  • 9. 
    The diagram below shows four energy levels in an atom, together with some possible electron transitions. Which one of the following best represents the emission line spectrum produced from these transitions?
    • A. 
    • B. 
    • C. 
    • D. 
  • 10. 
    Light is incident on two different metal surfaces L and H. The metals are in a vacuum. The surface L has a lower work function energy than surface H.          Which of the following graphs best shows the variation with frequency f of the maximum kinetic energy EMAX of photo-electrons emitted from both surfaces.
    • A. 
    • B. 
    • C. 
    • D. 
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