alleryAdding a few parts per million of impurity to a semiconductor makes its conductivity:
ADrop to zero
BStay the same
CFall slightly
DRise manifold
Answer & Solution
Correct answer: D. Rise manifold
1. The impurity adds many extra carriers.
2. Even a tiny amount matters.
3. Conductivity rises manifold.
_Source: syllabus Physics Part II, Chapter 14, Semiconductor Electronics._
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