List I | List II | ||
---|---|---|---|
A. | Copper | 1. | produces discrete energy level just above valence band |
B. | Rubber | 2. | produces discrete energy level just below conduction band |
C. | Antimony | 3. | large forbidden gap |
D. | Boron | 4. | valence and conduction bands overlap |
As we know, Gain with feedback
A = - 1000, ? = -0.1 .
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