A p-n junction diode cannot be used
A red LED emits light at 0.1 Watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is
Light Emitting Diode is a forward biased p-n junction diode.
In an electric torch, electric energy is converted into (a) light energy. (b) heat energy. (c) sound energy. (d) both light and heat energy