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Lesson: Insulators, Conductors, and Semiconductors

Worksheet • 7 Questions

Q1:

Glass and quartz are examples of .

  • Ainsulators
  • Bconductors
  • Csuperconductors
  • Dsemiconductors

Q2:

At low temperatures, semiconductors and insulators differ only in .

  • Aband gap size, with insulator band gaps being greater in energy than those of semiconductors
  • Bvalence band composition, with semiconductors and insulators having half- and fully filled HOMOs respectively
  • Cresistivity, with semiconductors being less conductive than insulators with increasing temperature
  • Delectron placement, with electrons occupying the conductance bands of semiconductors but not of insulators

Q3:

The LUMO of a semiconductor .

  • Ahas a limited number of electrons present
  • Bis often separated from the HOMO by an unsurmountable energy gap
  • Cserves to provide electrons to the valence band
  • Dserves as a dopant to the valence band

Q4:

For 𝑛 - t y p e semiconductors,

  • Aconduction band electrons outnumber valence band holes.
  • Belectron flow is halted due to dopant impurities.
  • Cdoping is facilitated by halides.
  • Dan equal number of valence band holes and conductor band electrons exist, making dopants unnecessary.

Q5:

The doping of silicon with which element would likely form an p-type semiconductor?

  • ABoron
  • BPhosphorus
  • CCarbon
  • DAntimony

Q6:

Raising the temperature of a metal serves to .

  • Aimpede conductivity due to increased atom vibration
  • Bease electron flow over band gaps
  • Callow the metal to behave as a superconductor
  • Dslow down the activity of the atom, promoting a gradual increase in conductivity

Q7:

Which of the following statements about semiconductors is true?

  • ASemiconductor conductivity increases with increasing temperature.
  • BIntrinsic superconductors require a dopant to conduct electricity.
  • CIntrinsic semiconductors are more efficient than extrinsic semiconductors.
  • DSemiconductors have no energy gap between the valence and conductor bands.
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