Question

A pn junction that radiates energy as light instead of as heat is called

Answer 1

Ciao,
the pn junctions that radiates energy as light instead of heat are of photodiode,of LED ,of
photo cell,of zener diode e.t.c
i really hope that you will find it helpful. stay blessed☺

Answer 2

Answer:

A pn junction that radiates energy as light instead of as heat is called a LED

Explanation:

LEDs are semiconductor diodes, electronic devices that permit current to flow in one direction only. When we apply forward voltage to the semiconducting element forming the PN junction, the N area containing electrons move toward the P area and holes move toward the N area. Electrons and holes combine near the junction and energy is released in the form of light that is emitted by the LED.