For a p-type silicon with boron acceptor density NA​=1×1016 cm−3,Calculate the temperature at which only half of the acceptors are ionized. The ionization energy of born acceptor in silicon is 0.045 eV. Assume the bandgap is independent of temperature.

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.