1. A p-n junction is a double layer of opposite charges separated by a small distance and has the properties of a capacitance. The resistivity of a semiconductor can be controlled by doping. Thus the elements in the trasistor circuit of Figure 13-24a can be manufactured on a p-n-p semiconductor with appropriate layers etched away as shown in Figure 13-24b. This is an integrated circuit. Label the appropriate parts of Figure 13-24b with the correspondig numbers and letters of Figure 13-24a . I just couldn't understand how to identify the parts. I just know that the electrons flow in the direction G - E - B. Could someone help me on this?