If the working probability of a state at the edge of the conduction band Ec, i. e. [f(Ec)] is the same, the probability of emptying a state at the edge of the valence band [1-(f(Ev)] in a semiconductor (pure). Prove that the Fermi level Ef must lie about halfway between Ec and Ev .

What is a good example of instantaneous speed

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

What sort of waves exhibit the doppler effect?