Chapter 32: The Atom And The Quantum

32 Questions | Total Attempts: 155

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Atom Quizzes & Trivia

Questions and Answers
  • 1. 
    Quantization of electron energy states in an atom is better understood in terms of the electron's
    • A. 

      Wave nature.

    • B. 

      Particle nature.

    • C. 

      Neither of these

  • 2. 
    An excited hydrogen atom is capable of emitting radiation ofAn excited hydrogen atom is capable of emitting radiation of
    • A. 

      A single frequency.

    • B. 

      3 frequencies.

    • C. 

      Many more than 3 frequencies.

  • 3. 
    The Schrödinger equation is restricted to
    • A. 

      Submicroscopic particles.

    • B. 

      Submicroscopic and microscopic particles.

    • C. 

      Macroscopic particles.

    • D. 

      None of these

  • 4. 
    In the Bohr model of hydrogen, discrete radii and energy states result when an electron circles the atom in an integral number of
    • A. 

      Wave frequencies.

    • B. 

      De Broglie wavelengths.

    • C. 

      Diffraction patterns.

    • D. 

      None of these

  • 5. 
    A beam of electrons has
    • A. 

      Wave properties.

    • B. 

      Particle properties.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 6. 
    When Rutherford had a stream of alpha particles hit a gold foil, most of the particles
    • A. 

      Bounced back.

    • B. 

      Went almost straight through.

    • C. 

      Stopped.

    • D. 

      Spiraled.

  • 7. 
    Alpha particles are repelled by atomic nuclei because
    • A. 

      Of the repelling interaction between an alpha particle and the atomic nucleus.

    • B. 

      Closeness of each to each other is not permitted.

    • C. 

      The force between the alpha particle and the atomic nucleus is opposite to an attractive force.

    • D. 

      They both have the same sign of electric charge.

    • E. 

      None of these

  • 8. 
    Most alpha particles fired at a gold foil pass through undeflected because the
    • A. 

      Electric field is zero inside the gold.

    • B. 

      Gold atoms, unlike most other metal atoms, are relatively far apart.

    • C. 

      Atoms of gold, like any others, are mostly empty space.

    • D. 

      Net charge of the gold atoms is zero.

    • E. 

      None of these

  • 9. 
    Some alpha particles fired through a gold foil bounce backward by
    • A. 

      Making direct hits with gold atoms.

    • B. 

      Electrostatic repulsion when close to gold nuclei.

    • C. 

      Electrostatic repulsion with the electron clouds of gold atoms.

    • D. 

      All of these

    • E. 

      None of these

  • 10. 
    Physics pioneers Balmer, Rydberg, and Ritz discovered in atomic spectra
    • A. 

      A randomness that opened the door to the nature of probabilities in atomic reality.

    • B. 

      Mathematical order.

    • C. 

      That all atoms are essentially the same size.

    • D. 

      That electrons occupy well-defined shells about the atomic nucleus.

    • E. 

      That electrons behave as standing waves.

  • 11. 
    According to Niels Bohr, an electron in an excited state could give off
    • A. 

      At most a single photon until the atom was excited again.

    • B. 

      Several photons in a series of transitions to the ground state.

    • C. 

      A continuous cascade of photons for a high-level transition.

    • D. 

      None of these

  • 12. 
    The Bohr model of the atom is akin to a
    • A. 

      Miniature solar system.

    • B. 

      Blob of plum pudding, where raisins represent atomic nuclei.

    • C. 

      Central heavy ball with lighter balls connected by springs.

    • D. 

      All of these

  • 13. 
    We now consider the Bohr model of the atom to be
    • A. 

      An accurate picture of a hydrogen atom.

    • B. 

      Totally useless – of historical interest only.

    • C. 

      Defective and oversimplified, but still useful.

  • 14. 
    A uranium atom is 238 times as massive as a hydrogen atom. The diameter of a uranium atom is the diameter of a hydrogen atom times about
    • A. 

      3.

    • B. 

      10.

    • C. 

      30.

    • D. 

      100.

    • E. 

      238.

  • 15. 
    Compared to the average diameter of a hydrogen atom, the average diameter of a helium atom is
    • A. 

      Larger.

    • B. 

      Smaller.

    • C. 

      About the same.

  • 16. 
    Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more
    • A. 

      Mass.

    • B. 

      Electric charge.

    • C. 

      Nucleons.

    • D. 

      All of these

    • E. 

      None of these

  • 17. 
    A key feature of the theory of chaos is
    • A. 

      Unpredictability.

    • B. 

      Very small initial differences can lead to very large eventual differences.

    • C. 

      The randomness of molecular motion makes prediction difficult.

    • D. 

      Even orderly systems are seen to be disorderly when carefully studied.

  • 18. 
    According to the correspondence principle, a new theory is valid if it
    • A. 

      Overlaps and agrees where the old theory works.

    • B. 

      Accounts for confirmed results from the old theory.

    • C. 

      Predicts the same correct results as the old theory.

    • D. 

      All of these

    • E. 

      None of these

  • 19. 
    The discreteness of energy levels is better understood by considering the electrons to be
    • A. 

      Like tiny planets orbiting a sun.

    • B. 

      Attached to the nucleus by massless springs.

    • C. 

      Much less massive than the nucleus.

    • D. 

      All of these

    • E. 

      None of these

  • 20. 
    Orbital electrons do not spiral into the nucleus because of
    • A. 

      Electromagnetic forces.

    • B. 

      Angular momentum conservation.

    • C. 

      The large nuclear size compared to the electron's size.

    • D. 

      The wave nature of the electron.

    • E. 

      None of these

  • 21. 
    The main reason electrons occupy discrete orbits in an atom is because
    • A. 

      Energy levels are quantized.

    • B. 

      Electric forces act over quantized distances.

    • C. 

      Electrons are basically discrete particles.

    • D. 

      The circumference of each orbit is an integral multiple of electron wavelengths.

    • E. 

      None of these

  • 22. 
    The quantum-mechanical probability cloud for the electron in the hydrogen atom has an average radius
    • A. 

      Quite different from the radius predicted by Bohr.

    • B. 

      That agrees with the orbital radius of Bohr.

  • 23. 
    The correspondence principle applies to
    • A. 

      Theories of submicroscopic phenomena.

    • B. 

      Theories of macroscopic phenomena.

    • C. 

      All good theories.

  • 24. 
    A new theory conforms to the correspondence principle when it
    • A. 

      Corresponds to all theories in nature.

    • B. 

      Updates the essence of the old theory.

    • C. 

      Ties two or more theories together.

    • D. 

      Accounts for verified results of the old theory.

    • E. 

      None of these

  • 25. 
    What do electrons have that protons always have in equal magnitude?
    • A. 

      Mass

    • B. 

      Charge

    • C. 

      Energy

    • D. 

      All of these

    • E. 

      None of these

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