JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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An electric field is applied to a semiconductor. Let the number of charge carries be

\mathrm{n}

and the average drift speed be v. if the temperature is increased, then

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Correct option: B

n

will increase and

v

will decrease

Option B is correct because as temperature increases in a semiconductor, more charge carriers are generated (n increases), but their average drift speed (v) decreases due to increased collisions.

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

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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