The ratio of the distance a bullet travels to the amount of time it takes to travel is known as the of the bullet, depending on whether we need to know the direction or not.

speed or velocity

Explanation:

The ratio of distance travels to the time taken is called speed.

Speed = distance traveled / time taken

Speed is a scalar quantity and its SI unit is m/s.

If the direction of distance given then it is velocity.

Velocity is defined as the ratio of displacement to the time taken.

Velocity is a vector quantity and its SI unit is m/s.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

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