Most of the carbon atoms in tyler have 6 neutrons, but about 1% of them have 7 neutrons. these different types of carbon atoms are known as of carbon.

The correct answer to the question is Isotope i.e these different types of carbon atoms are known as isotope of carbon.

EXPLANATION:

Before going to answer this, first we have to understand an isotope.

An isotope of an atom is defined as the atoms having same atomic number but different mass number.

The mass of number of an atom is the sum total of neutrons and protons.

Hence, mass number A = N + Z

Here, N stands for number of neutrons and Z stands for atomic number which is equal to the number of protons of the atom.

The atomic number of carbon is 6 . Normally it contains 6 number of neutrons.  But about 1% of carbon atoms contain 7 number of neutrons which increases the mass number of carbon atom. The carbon atom formed has same number of protons but different mass number.

Hence, it is considered as an isotope of the carbon.

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