Solid state physics, thermodynamics, statistical mechanics [40 points] there isa semiconductor with two bands: the lower band is described by e(k), the upper band by eo-e(k). the two bands are separated by an energy gap of 24 (hint: use electron-hole symmetry. this is also evident from the way the upper band is defined.) a. calculate the chemical potential as a function of the temperature. [20 points 3. b. examine whether the system can be treated using classical statics at low temperatures. 20 points