Germanium to which 1024 m–3 as atoms have been added is an extrinsic semiconductor at room temperature, and virtually all the as atoms may be thought of as being ionized (i. e., one charge carrier exists for each as atom).
(a) is this material n-type or p-type?
(b) calculate the electrical conductivity of this material, assuming electron and hole mobilities of 0.1 and 0.05 m2/v-s, respectively.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.