- In a typical lightning flash the potential difference between discharge points is about 1.0 x 10° V and the quantity of charge transferred is about 30 C. If all the energy released could be used to accelerate a 140O kg automobile from rest, what would be its final speed in km/h?

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Photoconductive Cell

Photoconductive cells are light-sensitive resistors in which resistance is inversely proportionated to light intensity when illuminated. These devices consist of a thin single-crystal or polycrystalline film of composite semiconductor materials. Cadmium sulfide (CdS) is used to make the most commercially available photoconductive particles which are sensitive to light in the visible spectrum. Other less commonly used substances respond to infrared light, but not to the visible spectrum. Such substances are lead sulfide (PbS), lead selenide (PbSe), and lead telluride (PbTe), and so on.