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A trivalent impurity is known as an:

AOscillator
BAcceptor
CAmplifier
DInsulator
Answer & Solution
Correct answer: B. Acceptor
1. It leaves a bond short of one electron. 2. That vacancy can accept an electron from a neighbour. 3. So the trivalent impurity is an acceptor. 4. The answer is acceptor. _Source: syllabus Physics, Ch 14 'Semiconductor Electronics'_
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