JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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n

-type and a

p

-type silicon semiconductor can be obtained by doing pure silicon with

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Correct option: B

Phosphorus and boron respectively

Option B (Phosphorus and boron respectively) is correct because Phosphorus is a pentavalent impurity used for creating n-type semiconductors, while Boron is a trivalent impurity used for creating p-type semiconductors.

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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