Analog Electronics
The fact that there are many free electrons in a transistor emitter region means the emitter is

 undoped.
 lightly doped.
  heavily doped.
None of these

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Analog Electronics
The common-source JFET amplifier has

  no voltage gain.
  a very high input impedance and a relatively low voltage
  a high input impedance and a voltage gain less than 1.
  a high input impedance and a very high voltage gain.

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