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Worksheet: Insulators, Conductors, and Semiconductors

Q1:

Glass and quartz are examples of .

  • Asemiconductors
  • Bconductors
  • Csuperconductors
  • Dinsulators

Q2:

At low temperatures, semiconductors and insulators differ only in .

  • Aelectron placement, with electrons occupying the conductance bands of semiconductors but not of insulators
  • 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
  • Dband gap size, with insulator band gaps being greater in energy than those of semiconductors

Q3:

The LUMO of a semiconductor .

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

Q4:

For 𝑛 - t y p e semiconductors,

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

Q5:

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

  • AAntimony
  • BPhosphorus
  • CCarbon
  • DBoron

Q6:

Raising the temperature of a metal serves to .

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

Q7:

Which of the following statements about semiconductors is true?

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