Q. GaAs (with a band gap $= 1.5\ eV$) as an LED can emit
A) Blue light
B) Green light
C) Ultraviolet rays
D) Infrared rays
Explanation
(d) GaAs $(Eg = 1.5\ eV)$ is used for making infrared LED
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.