JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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The addition of antimony atoms to a sample of intrinsic germanium transforms it to a material which is

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Correct option: C

N

-type semiconductor

Option C (

N

-type semiconductor) is correct because antimony is a pentavalent impurity, which donates extra electrons to the germanium lattice, creating an N-type semiconductor.

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A PN-junction has a thickness of the order of In a

PNP

transistor the base is the

N

-region. Its width relative to the

P

-region is A solid reflects incident light and its electrical conductivity decreases with temperature. The binding in this solid is An alternating current can be converted into direct current by a A N–P–N transistor is used in inverse active mode of operation then its emitter base junction should be in In the case of constants

\mathrm{\alpha\; and\; \beta }

of a transistor