1. The problem statement, all variables and given/known data A silicon sample is doped with 5.0 X 10^19 donor atoms/cm^3 and 5.0 X 10^19 acceptor atmos/cm^3 a)What is its resistivity? b)Is this an insulator, conductor or semiconductor? c)Is this intrinsic material? 2. Relevant equations No clue.. this is where I need help 3. The attempt at a solution The question completely threw me off. I am assuming I can answer b and c once I calculate part a, but I have no clue which equation to use. Can anybody start me off?