An advantage of using longitudinal studies is that

Explanation:

The longitudinal studies is a method of observational research. The advantages of using longitudinal studies are:

It allows for high levels of validity.

The data collected is unique.

The primary advantage of using longitudinal studies is used for forms of research. It helps to find the patterns. The patterns may occur over long period.

It is not observed over short period.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

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