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Holes exist as vacant levels created in the:

AConduction band
BForbidden gaps
CExternal circuit
DValence band
Answer & Solution
Correct answer: D. Valence band
1. An electron leaving the lower band goes to the upper one. 2. It leaves an empty level exactly where it was. 3. So holes are vacancies in the valence band. 4. The answer is valence band. _Source: syllabus Physics, Ch 14 'Semiconductor Electronics'_
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