In a junction transistor the emitter, base and collector are made of
A
extrinsic semiconductors.
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B
intrinsic semiconductors.
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C
both A and B.
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D
metal.
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Solution
The correct option is D extrinsic semiconductors. Transistors are made by stacking of a doped (extrinsic) semiconductor to a p-n junction diode either from p-side or n-side, in order to make a sequence either p-n-p or n-p-n. These three regions are named as emitter, base and collector respectively.