Analog Electronics
The major advantage of a photo transistor as compared to a photo diode is its

 response to higher frequencies.
  increased sensitivity.
 AC operation.
 durability.

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Analog Electronics
The common-source JFET amplifier has

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

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