2. MATERIALS AND BAND STRUCTURE (A). Draw the E-r (energy versus position) diagram for an insulator, semiconductor, and metal at 0 K. Label your diagram and show where the electrons reside. (B). The E-k diagrams of material i and material ii are given in Fig. 2.1: The equations for the E vs k diagram for the figure are: Figure 2.1: Energy diagram for Q3 E? =21038k2(Joule) (2.1) E? =81038k2(Joule) (2.2) Match the equations with their corresponding material based on the E-k diagram. Explain your reasoning. (C). 3. Find out the electron effective masses (in kg unit) of material i and material