Analog Electronics
The amount of time between the creation and disappearance of a free electrons is called

 bound electrons
 recombination
 drift velocity
 life time of the carriers

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Analog Electronics
The common-source JFET amplifier has

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

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