(2) 因時效而取得地上權登記請求權者，在未為登記前，其占有該地，有無正當權源？

5. (10%) A p-type semiconductor has the doping level \( N{A} = 1.5 \times 10^{16} / \mathrm{cm}^{3} \). Assume that \( n{i} = 2 \times 10^{10} / \mathrm{cm}^{3} \). Find the hole and electron concentrations (you must specify what value is hole concentration and what value is electron concentration).