Electronic Devices and Circuits - Engineering

Q1:

In LED the radiation is in

A visible region

B infrared region

C both (a) and (b)

D neither (a) nor (b)

ANS:D - neither (a) nor (b)

LED is made up of GaAs ---> infrared.

LED is made up of GaAsP ---> Visible.

So option C is the answer.