In light emitting diode (LED), light is given out due to

In light emitting diode (LED), light is given out due to
  1. drifting of electrons.
  2. diffusion of holes.
  3. recombination of holes and electrons.
  4. emission of holes and electrons.

Solution

Light is given out in a light-emitting diode (LED) because of the recombination of electrons and holes in a semiconductor .

Asked in: MHT CET 2020 (20 Oct Shift 1)

Practice more Semiconductors questions on Aicharya