Analog Electronics
When a reverse bias is applied to a diode, it will

  increases the majority carrier an electric current greatly.
  none of these.
  lower the potential barrier.
  raise the potential barrier.

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Analog Electronics
For transistor action

  the base region must be very thin and lightly doped.
  all of these.
  the emitter should be heavily doped.
  Je must be forward biased and Jc should be reverse biased.

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