Answer: AND gate.
- A OR gate
- B AND gate
- C NOR gate
- D XOR gate
Correct answer: B. AND gate
Explanation: Inverting the NAND output gives NOT(NOT(A·B)) = A·B, which is the AND function.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.