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?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to