Boron atoms are added to a si film resulting in an impurity density of 4 × 1016 cm–3. (a) what is the conductivity type (n-type or p-type) of this film? (b) what are the equilibrium electron and hole densities at 300 k and 600 k? (c) why does the mobile carrier concentration increase at high temperatures? (d) where is the fermi level located if t = 600 k?

Aforce of 34n stretches a very light ideal spring 0.73 m from equilibrium, what is the force constant (spring constant) of the spring? (a) 47n/m (b) 38n/m (c) 53n/m (d) 25n/m

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

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