At very high temperatures the extrinsic semi conductors become intrinsic because

Electronics and Communication Engineering (ECE) : Electronic Devices and Circuits - Quiz(MCQ)

drive in diffusion of dopants and carriers

band to band transition is balanced by impurity ionization

band to band transition dominants over impurity ionization

impurity ionization dominants over band to band transition

Correct Answer : Option (C) : band to band transition dominants over impurity ionization

Explanation : Covalent bonds are broken

Recently Updated in Electronic Devices and Circuits Questions

The kinetic energy of photoelectrons emitted by a photo sensitive surface depends on

angle of incidence of radiation

surface conditions of the surface

intensity of the incident radiation

wavelength of the incident radiation

Correct Answer : wavelength of the incident radiation

For radiating ultraviolet rays, LEDs use

gallium arsenide

zinc sulphide

gallium phosphide

None of the above

Correct Answer : zinc sulphide

For an P-N-P transistor in normal operation its junction are biased as

emitter base : reverse, collector base : reverse

emitter base : reverse, collector base : forward

emitter base : forward, collector base : forward

emitter base : forward, collector base : reverse

Correct Answer : emitter base : forward, collector base : reverse