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

 lightly doped.
None of these
 undoped.
  heavily doped.

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Analog Electronics
For an NPN transistor in normal bias

  only holes cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  the emitter junction has high resistance.
  only majority carriers cross the collector junction.

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Analog Electronics
In a transistor amplifier, the reverse saturation electric current ICO

  double for every 5° rise in temperature.
  double for every 10° rise in temperature.
  increase linearly with the temperature.
  double for every 1° rise in temperature.

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