In a bipolar junction transistor, which of its three regions — emitter, base, or

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1. In a bipolar junction transistor, which of its three regions — emitter, base, or collector — has the lowest concentration of impurity doping?

All three regions are equally doped

The emitter has the lowest doping concentration

The collector has the lowest doping concentration

The base has the lowest doping concentration

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The base is deliberately made thin and lightly doped, compared to the heavily doped emitter and moderately doped collector — a design essential to how a transistor amplifies current.