Chapter 18, Problem 26ICA

Cadmium sulfide (CdS) is a semiconducting material with a pronounced sensitivity to light—as more light strikes it, its resistance goes down. In real devices, the resistance of a given device may vary over four orders of magnitude or more. An experiment was set up with a single light source in an otherwise dark room. The resistance of three different CdS photoresistors was measured when they were at various distances from the light source. The farther they were from the source, the dimmer tile illumination on the photoresistor.

Create a proper plot of the data. Use polyfit to determine a power model for each data set. For each model, add the trend line and the associated trend line equation to the graph. Use an appropriate location for the equations to clearly associate them with the correct trendline.