Q. LED is a $p$-$n$ junction diode which is

A) Forward biased
B) Either forward biased or reverse biased
C) Reverse biased
D) Neither forward biased nor reverse biased
Explanation

(a) When a junction diode is forward biased, energy is released at the junction due to recombination of electrons and holes. In the junction diode made of gallium arsenide or indium phosphide the energy is released in visible region. Such a junction diode is called a light emitting diode or LED.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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