You are given a piece of material (you suspect it's a semiconductor but are not sure) and know nothing about it (except that it looks transparent to the eye).

a. What is the minimum band gap energy that you expect this material to have?
b. Describe an experiment to determine its conductivity. Be specific about details: set up, what equipment is used to measure each variable, and plot the data you expect to get.
c. Describe an experiment (or set of experiments) to determine its energy gap, electron affinity, and ionization potential. Be specific as in b.
d. From the above experiments, how can you be sure it's a semiconductor and not a metal?