at room temperature the electrical conductivity of pbte is 500 (ω-m)–1, whereas the electron and hole mobilities are 0.16 and 0.075 m2/v-s, respectively. compute the intrinsic carrier concentration for pbte at room temperature.

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).