Electric Materials Properties Quiz
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Questions and Answers

What do optical properties refer to?

  • A material's color under visible light
  • A material's ability to conduct electricity
  • A material's response to exposure to electromagnetic radiation (correct)
  • A material's response to exposure to X-rays

    • What does the term 'photon energy' refer to?

  • The color of a photon when observed under a microscope
  • The ability of a photon to conduct electricity
  • The speed of a photon when traveling through a vacuum
  • The energy of a photon which comes in specific, discrete amounts or levels (correct)

    • What is the significance of photon energy?

  • It determines the material's ability to emit light
  • It indicates the material's ability to conduct electricity
  • It affects the material's color under visible light
  • It is related to the energy levels of photons (correct)

    • What are some optical applications mentioned in the text?

    <p>Luminescence, photoconductivity, and solar cell</p> Signup and view all the answers

    Which chapter in the course contents would most likely cover the topic of optoelectronics?

    <p>Optical Properties (Chapter 21)</p> Signup and view all the answers

    What kind of energy is associated with a photon?

    <p>Quantized energy</p> Signup and view all the answers

    What happens when light proceeds from one medium into another?

    <p>Some of the light radiation may be transmitted through the medium, some will be absorbed, and some will be reflected at the interface between the two media</p> Signup and view all the answers

    Why do metals appear opaque in the visible range?

    <p>Energy from the light can excite electrons in the metal, preventing light from passing through</p> Signup and view all the answers

    What is the consequence of electronic polarization in a medium?

    <p>Absorption of radiation energy</p> Signup and view all the answers

    What causes luminescence in solids?

    <p>Emission of visible light from electron transitions in solids</p> Signup and view all the answers

    What is the function of compact fluorescent lamps (CFLs)?

    <p>To replace incandescent bulbs</p> Signup and view all the answers

    How does photoconductivity in semiconductors depend on illumination?

    <p>The conductivity increases with illumination</p> Signup and view all the answers

    What is a common material used in light meters for measuring photo-induced current?

    <p>Cadmium sulfide</p> Signup and view all the answers

    What is a direct function of the magnitude of the photo-induced current in light meters?

    <p>The intensity of the incident light radiation</p> Signup and view all the answers

    What is a key reason why metals don't transmit visible light like some other materials?

    <p>Interaction between light and electrons causes absorption of energy, preventing light from passing through</p> Signup and view all the answers

    What kind of radiation are metals transparent to?

    <p>UV and x-ray radiation only</p> Signup and view all the answers

    What emits UV light to activate fluorescence in compact fluorescent lamps?

    <p>Mercury vapor</p> Signup and view all the answers

    What types of materials typically require impurities to induce luminescence?

    <p>Sulfides, oxides, tungstates, some organic materials</p> Signup and view all the answers

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