Analog Electronics
Acceptor type impurities

 are used to make P-type semiconductor
 Create excess holes
All of these
 have three valance electrons

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Analog Electronics
For transistor action

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

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