In the absence of excitation, the conduction band is normally:
AFully doubled
BLeft empty
CWell crowded
DQuite overfull
Answer & Solution
Correct answer: B. Left empty
1. Electrons need energy to reach this band.
2. Without that energy none arrive.
3. So the conduction band is normally empty.
_Source: NCERT Class 12 Physics Part II, Chapter 14, Semiconductor Electronics._
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