Electronic Materials EC210: Lattice Vibrations in Insulators
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Questions and Answers

What does the solid line in the graph represent?

  • Thermal conductivity vs. electrical conductivity relationship
  • Wiedemann-Franz Law (correct)
  • Thermal energy carried by conducting electrons
  • Specific heat capacity of metals
  • At 20°C, which material shows the highest thermal conductivity among the listed metals?

  • Gold
  • Nickel
  • Copper
  • Silver (correct)
  • What is the relationship between thermal conductivity and electrical conductivity according to the Wiedemann-Franz Law?

  • They are exponential functions of each other
  • They are directly proportional (correct)
  • They are inversely proportional
  • There is no relationship between them
  • Which metal has the lowest thermal conductivity among the listed materials at 20°C?

    <p>Aluminum</p> Signup and view all the answers

    What is the main carrier of thermal energy in metals?

    <p>Conduction electrons</p> Signup and view all the answers

    Based on the graph, which material shows both high thermal and electrical conductivity?

    <p>Gold</p> Signup and view all the answers

    What is responsible for the conduction of heat in insulators?

    <p>Atomic vibrations through the bonds coupling the atoms</p> Signup and view all the answers

    How are conduction electrons in metal frequently and randomly scattered?

    <p>By thermal vibrations of the atoms</p> Signup and view all the answers

    What is the result of applying an electric field to a metal with conduction electrons?

    <p>Net drift of electrons along the force of the field</p> Signup and view all the answers

    Which type of motion characterizes a conduction electron in a metal in the absence of an applied field?

    <p>Random motion with no net drift</p> Signup and view all the answers

    What effect does the presence of an applied field have on the motion of a conduction electron?

    <p>Superimposes net drift along the x-direction on random motion</p> Signup and view all the answers

    Which process is involved in the conduction of heat in insulators?

    <p>Generation and propagation of atomic vibrations through atom bonds</p> Signup and view all the answers

    What is the average velocity at which electrons drift in a conductor when an electric field is applied?

    <p>vdx</p> Signup and view all the answers

    In the context of metal conductivity, what is the term used for the physical origin of molecular field theory?

    <p>Ferromagnetism</p> Signup and view all the answers

    Which type of conductivity is associated with the drift of electrons in a conductor when an electric field is applied?

    <p>Metal conductivity</p> Signup and view all the answers

    What is the relation between polarizability and frequency in dielectrics, as discussed in the provided text?

    <p>Directly proportional</p> Signup and view all the answers

    What is the primary classification for types of magnetic materials discussed in the text?

    <p>Ferromagnetic and paramagnetic</p> Signup and view all the answers

    In the context of heat conduction in insulators, which factor plays a significant role?

    <p>Lattice vibrations</p> Signup and view all the answers

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