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