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

 drift velocity
 life time of the carriers
 recombination
 bound electrons

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Analog Electronics
For an NPN transistor in normal bias

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

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