Discussion
The thin, lightly doped region between emitter and collector is the ______.
Answer: C
This is the base, and both its thinness and its light doping exist so that injected carriers cross it without recombining. A channel belongs to a field effect transistor, a substrate is the wafer the device is built on, and a depletion layer is the carrier-free zone at a junction. Every one of the base's properties is chosen to serve transistor action, which is why the region is so much harder to make than either of the others. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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