How does quantum theory explain the working of a photocell?

Each photon of light with a certain minimum energy releases an electron from an atom.

Explanation:

A photocell works on the principle of photoelectric effect. A proton is taken to have a particle nature hence photons have to interact with electrons.In this particular experiment, photons have energy greater than the work function of the metal and thus ejects electrons from the plate.

reserve is the answer

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia