Which option in the following best explains the base of a transistor?
Correct answer: B. The base has less concentration of impurity as compared to emitter and collector
- A. The base has no impurity
- B. The base has less concentration of impurity as compared to emitter and collector
- C. The base has more concentration of impurity as compared to the emitter
- D. The base has more concentration of impurity as compared to the collector
Explanation
In an npn as well as pnp transistor, the collector and emitter will be much more strongly doped than the base. This is to say, the collector and emitter will have more impurities in their construction, which will result in higher electrical conductivity. In a transistor, the base is made very thin and is lightly doped with an impurity, to enable the collector to collect about 95% of the holes or electrons coming from the emitter side.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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