Worksheet: Insulators, Conductors, and Semiconductors

In this worksheet, we will practice describing insulators, conductors, and semiconductors and relating their properties to their applications.

Q1:

Fill in the blank: Glass and quartz are examples of .

  • Asemiconductors
  • Bsuperconductors
  • Cconductors
  • Dinsulators

Q2:

Fill in the blank: The LUMO of a semiconductor .

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

Q3:

Fill in the blank: The doping of silicon with would likely form a p-type semiconductor.

  • Aphosphorus
  • Bantimony
  • Ccarbon
  • Dboron

Q4:

Fill in the blank: For 𝑛-type semiconductors, .

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

Q5:

Fill in the blank: At low temperatures, semiconductors and insulators differ only in .

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

Q6:

Which of the following statements about semiconductors is true?

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

Q7:

Fill in the blank: Raising the temperature of a metal serves to .

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

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