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JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

1 Medium

1 of 1

Understanding +4 | -1

GaAs (with a band gap

= 1.5\,eV

) as an LED can emit

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Correct option: D

Infrared rays

Option D (Infrared rays) is correct because GaAs with a band gap of 1.5 eV emits photons in the infrared region.

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

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-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