Germanium to which 1024 m-3 ga atoms have been added is an extrinsic semiconductor at room temperature, and virtually all the ga atoms may be thought of as being ionized (i. e., one charge carrier exists for each ga atom). calculate the electrical conductivity of this material in (ω·m)-1 , assuming electron and hole mobilities of 0.26 and 0.020 m2 /(v·s), respectively