Chapter 31: Light Quanta

42 Questions | Total Attempts: 139

SettingsSettingsSettings
Please wait...
Chapter 31: Light Quanta

Questions and Answers
  • 1. 
    In the equation E = hf, the f stands for
    • A. 

      Wave frequency as defined for sound, radio, and light waves.

    • B. 

      The smaller wavelengths of visible light.

    • C. 

      Frequency characteristic of quantum phenomena.

    • D. 

      None of these

  • 2. 
    The ratio of the energy of a photon to its frequency is
    • A. 

      Pi.

    • B. 

      Planck's constant.

    • C. 

      The photon's speed.

    • D. 

      The photon's wavelength.

    • E. 

      Not known.

  • 3. 
    Which has less energy per photon?
    • A. 

      Red light

    • B. 

      Blue light

    • C. 

      Both have the same energy.

  • 4. 
    Which has more energy per photon?
    • A. 

      Red light

    • B. 

      Blue light

    • C. 

      Both have the same energy.

  • 5. 
    Which of the following photons has the greatest energy?
    • A. 

      Infrared

    • B. 

      Red light

    • C. 

      Green light

    • D. 

      Blue light

    • E. 

      Ultraviolet

  • 6. 
    The photoelectric effect best demonstrates the
    • A. 

      Wave nature of light.

    • B. 

      Particle nature of light.

    • C. 

      Both of these

    • D. 

      None of these

  • 7. 
    In the photoelectric effect, the brighter the illuminating light on a photosensitive surface, the greater the
    • A. 

      Number of ejected electrons.

    • B. 

      Velocity of ejected electrons.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 8. 
    In the photoelectric effect, the greater the frequency of the illuminating light, the greater the
    • A. 

      Number of ejected electrons.

    • B. 

      Maximum velocity of ejected electrons.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 9. 
    A lump of energy associated with light is called a
    • A. 

      Quantum.

    • B. 

      Photon.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 10. 
    A quantum of light is called a(n)
    • A. 

      Proton.

    • B. 

      Neutron.

    • C. 

      Electron.

    • D. 

      Notron.

    • E. 

      None of these

  • 11. 
    The ratio of a photon's energy to its frequency is
    • A. 

      Its speed.

    • B. 

      Its wavelength.

    • C. 

      Its amplitude.

    • D. 

      Planck's constant.

    • E. 

      None of these

  • 12. 
    Light behaves primarily as a wave when it
    • A. 

      Travels from one place to another.

    • B. 

      Interacts with matter.

  • 13. 
    Light behaves primarily as a particle when it
    • A. 

      Travels from one place to another.

    • B. 

      Interacts with matter.

  • 14. 
    Which experiment best demonstrates the particle-like nature of light?
    • A. 

      Photoelectric effect

    • B. 

      Double-slit experiment

    • C. 

      Neither

  • 15. 
    In the double-slit experiment with electrons, the electrons arrive at the screen in a
    • A. 

      Particle-like way with a pattern that is particle-like.

    • B. 

      Particle-like way with a pattern that is wave-like.

    • C. 

      Wave-like way with a pattern that is particle-like.

    • D. 

      Wave-like way with a pattern that is wave-like.

  • 16. 
    Quantum uncertainties are most predominant for simultaneously measuring the speed and location of
    • A. 

      A baseball.

    • B. 

      A spitball.

    • C. 

      An electron.

  • 17. 
    The uncertainty principle applies not only to momentum and position, but also to energy and time. This statement is
    • A. 

      True.

    • B. 

      False.

  • 18. 
    According to the uncertainty principle, the more we know about a particle's momentum, the less we know about its
    • A. 

      Kinetic energy.

    • B. 

      Mass.

    • C. 

      Speed.

    • D. 

      Location.

    • E. 

      None of these

  • 19. 
    According to quantum physics, looking at a star through a telescope
    • A. 

      Affects the processes occurring in the star.

    • B. 

      Has no effect on the processes occurring in the star.

  • 20. 
    In the relationship E = hf for a photon emitted from an atom, the symbol E is used to represent the energy
    • A. 

      Of the emitted photon.

    • B. 

      Difference between atomic energy states producing the photon.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 21. 
    Two beams of light, a red beam and a blue beam, have the same energy. The beam with the greater number of photons is the
    • A. 

      Red beam.

    • B. 

      Blue beam.

    • C. 

      Both the same

  • 22. 
    A photosensitive surface is illuminated with both blue and violet light. The light that will cause the most electrons to be ejected is the
    • A. 

      Blue light.

    • B. 

      Violet light.

    • C. 

      Both eject the same number.

    • D. 

      Not enough information given

  • 23. 
    To study the energy of photoelectrons we measure
    • A. 

      The potential difference required to stop them.

    • B. 

      The distance they travel in a given time.

    • C. 

      The time they take to go a given distance.

    • D. 

      Their temperature.

  • 24. 
    Which of the following is not quantized?
    • A. 

      Energy

    • B. 

      Radiation

    • C. 

      Number of people in a room

    • D. 

      Electric charge

    • E. 

      All are quantized.

  • 25. 
    Two photons have the same wavelength. They also have the same
    • A. 

      Frequency.

    • B. 

      Energy.

    • C. 

      Both of these

    • D. 

      Neither of these

Related Topics
Back to Top Back to top