Aproperty unique to a conducting substance that determines its resistance is called

Electrical Resistivity

Explanation:

As we know that all different type of conductors has its different unique resistivity due to which all conductors will show different resistance for same shape and size.

As we know that the resistance of a conductor is given as

here we know

= resistivity

L = length of conductor

A = crossectional area of conductor

so here for all conductors the resistivity is unique property due to which all will show different resistance

i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

a electromagnetic waves