GaAs has an energy gap 1.43 eV the optical cut off wavelength of GaAs would lie in the

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

visible region of the spectrum

infrared region of the spectrum

ultraviolet region of the spectrum

for ultraviolet region of the spectrum

Correct Answer : Option (B) : infrared region of the spectrum

Explanation : GaAs has very large band gap and high carrier mobility.

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