Analog Electronics
A 741 C has

  a voltage gain of 100,000.
All of these
  an output impedance of 75 Ω.
  an input impedance of 2 MΩ.

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Analog Electronics
For transistor action

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

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