1. (8 points) The purpose of this problem is to review terminology related to p-n junction physics. (a) What is the category of impurities used in semiconductors that the subscript

"A"stands for in NA? (b) What is the category of impurities used in semiconductors that the subscript "D"stands for in Np? (c) What category of impurities is used to make a semiconductor n-type? (d) What is the typical valence of elements used to make silicon n-type? (e) What category of impurities is used to make a semiconductor p-type? (f) What is the typical valence of elements used to make silicon p-type? (g) In an n-type semiconductor, in which band are most of the free electrons found? (h) In an p-type semiconductor, in which band are most of the free holes found?