Analog Electronics
The fact that there are many free electrons in a transistor emitter region means the emitter is

None of these
 lightly doped.
  heavily doped.
 undoped.

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Analog Electronics
A working diode must have

 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased
 Low resistance when forward or reverse biased

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