Analog Electronics
The diffusion capacitance of a forward biased P+N junction diode with a steady electric current I depends on

  junction area.
  mean life time of the electrons.
  mean life time of the holes.
  width of the depleted region.

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

High input resistance and low output resistance
Negligible input resistance and high output resistance
Medium input resistance and high output resistance
Low input resistance as well as output resistance

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