Can someone me with this question.
your will be much appreciated.

q: through what potential difference must electrons be accelerated so that they will exhibit wave nature in passing through a pinhole 0.1 in diameter

Explanation:

The de Broglie wavelength of the electron is given by

where

is the Planck constant

is the mass of the electron

v is its speed

We want the electron to have a wavelength of

(the diameter of the pinhole)

Substituting in the equation above, we find what speed the electron should have:

Now, when a charged particle is accelerated through a potential difference, the kinetic energy it gains is equal to the change in electric potential energy, therefore:

where

is the electron charge

is the potential difference

And solving for ,

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