In this problem you are asked to solve the schrödinger equation for a particle of mass m constrained to move on a circle of radius r with a polar angle θ 2mr2d62 (i) what is the boundary condition? hint: what happens to if the angle goes a full circle? (ii) apply the boundary condition to find the wave functions ψ(θ) and the corresponding energies e; specify the range of any discrete values in your result. hint: it may be easier to work with complex functions. (iii) apply this model to benzene by assuming 6 mobile electrons moving on a ring with a radius of 1.39 a. calculate the wavelength (in nm) of the lowest-energy electronic transition. in what region of the electromagnetic spectrum is this?

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

elctricity and magnet is conversion to it