Chapter 30: Light Emission

65 Questions | Total Attempts: 275

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Chapter 30: Light Emission

Questions and Answers
  • 1. 
    Light from a lit match comes from
    • A. 

      Electrons.

    • B. 

      Protons.

    • C. 

      Neutrons.

    • D. 

      All of these

  • 2. 
    To say that energy levels in an atom are discrete is to say the energy levels are well defined and
    • A. 

      Separate from one another.

    • B. 

      Separated from one another by the same energy increments.

    • C. 

      Continuous.

    • D. 

      Private.

  • 3. 
    Electrons with the greater potential energies with respect to the atomic nucleus are
    • A. 

      Inner electrons.

    • B. 

      Outer electrons.

    • C. 

      Both the same, actually

  • 4. 
    An excited atom is an atom
    • A. 

      That has excess vibration.

    • B. 

      That has one or more displaced electrons.

    • C. 

      With more protons than electrons.

    • D. 

      That is frantic.

  • 5. 
    Light is emitted when an electron
    • A. 

      Is boosted to a higher energy level.

    • B. 

      Makes a transition to a lower energy level.

    • C. 

      Neither of these

  • 6. 
    An atom that absorbs a photon of a certain energy can then emit
    • A. 

      Only a photon of that energy.

    • B. 

      A photon of any energy.

    • C. 

      Only a photon of the same or higher energy.

    • D. 

      Only a photon of the same or lower energy.

  • 7. 
    A throbbing pulse of electromagnetic radiation is called a
    • A. 

      Proton.

    • B. 

      Photon.

    • C. 

      Lightron.

    • D. 

      Sparktron.

    • E. 

      Notron.

  • 8. 
    The energy of a photon is related to
    • A. 

      The energy given to the atom that emits it.

    • B. 

      The energy level difference though which it falls.

    • C. 

      Its frequency.

    • D. 

      All of these

    • E. 

      None of these

  • 9. 
    The highest frequency light of those below is
    • A. 

      Red.

    • B. 

      Green.

    • C. 

      Blue.

    • D. 

      Violet.

    • E. 

      All the same

  • 10. 
    Which color of light carries the most energy per photon?
    • A. 

      Red

    • B. 

      Green

    • C. 

      Blue

    • D. 

      Violet

    • E. 

      All the same

  • 11. 
    Ultraviolet light is
    • A. 

      More energetic than X-rays.

    • B. 

      Produced by crossed Polaroids.

    • C. 

      Electromagnetic energy.

    • D. 

      Present everywhere.

    • E. 

      None of these

  • 12. 
    Compared to the energy of a photon of red light, the energy of a photon of blue light is
    • A. 

      Less.

    • B. 

      More.

    • C. 

      The same.

  • 13. 
    Atoms of neon in a glass tube can be excited
    • A. 

      Once per atom.

    • B. 

      Over and over again.

  • 14. 
    The variety of colors seen in a burning log comes from the variety of
    • A. 

      Multi-layered incandescent surfaces.

    • B. 

      Electron transitions in various atoms.

    • C. 

      Temperatures.

    • D. 

      Chemicals in the log.

    • E. 

      Absorbing gases between the log and the viewer.

  • 15. 
    Fluorescent minerals on display in museums are illuminated with
    • A. 

      Infrared light.

    • B. 

      Ultraviolet light.

    • C. 

      Often either or both

    • D. 

      None of these

  • 16. 
    The greater proportion of energy immediately converted to heat rather than light occurs in
    • A. 

      A fluorescent lamp.

    • B. 

      An incandescent lamp.

    • C. 

      Both the same

  • 17. 
    Light from two closely spaced stars will not produce a steady interference pattern at the Earth's surface because of
    • A. 

      Incoherence.

    • B. 

      The inherent instability of the atmosphere.

    • C. 

      Their different radial distances.

    • D. 

      Their non-point like natures.

    • E. 

      Closely spaced stars do produce interference patterns.

  • 18. 
    A photographer wishes to use a safety light in the darkroom that will emit low-energy photons. The best visible color to use is
    • A. 

      Violet.

    • B. 

      Blue.

    • C. 

      Green.

    • D. 

      Actually any of these

    • E. 

      None of these

  • 19. 
    Discrete spectral lines occur when excitation takes place in a
    • A. 

      Solid.

    • B. 

      Liquid.

    • C. 

      Gas.

    • D. 

      Superconductor.

    • E. 

      All of these

  • 20. 
    Light frequency from an incandescent lamp depends on the
    • A. 

      Amount of electrical energy transformed.

    • B. 

      Rate of atomic and molecular vibrations.

    • C. 

      Voltage applied to the lamp.

    • D. 

      Electrical resistance of the lamp.

    • E. 

      Transparency of glass.

  • 21. 
    Isolated bells ring clear, while bells crammed in a box have a muffled ring. If the sound of isolated bells is analogous to light from a gas discharge tube, then sound from the box crammed with bells is analogous to light from
    • A. 

      A laser.

    • B. 

      A fluorescent lamp.

    • C. 

      An incandescent lamp.

    • D. 

      A phosphorescent source.

    • E. 

      None of these

  • 22. 
    An atom that emits a certain frequency of light is
    • A. 

      Not likely to absorb that same frequency.

    • B. 

      An absorber of the same frequency.

  • 23. 
    The dark lines in the sun's spectrum represent light that is
    • A. 

      Absorbed by the sun's atmosphere.

    • B. 

      Emitted by the sun.

    • C. 

      Not emitted by the sun.

  • 24. 
    Spectral lines take the shape of vertical lines because
    • A. 

      The light is vertically polarized.

    • B. 

      They are simply images of a vertical slit.

    • C. 

      The energy levels in the atom are parallel to one another.

    • D. 

      All of these

    • E. 

      None of these

  • 25. 
    Helium was first discovered in the
    • A. 

      Laboratory.

    • B. 

      Upper atmosphere.

    • C. 

      Sun.

    • D. 

      Island of Helios, in Greece.

    • E. 

      By-products of nuclear fusion.

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