In a fluorescence-lifetime experiment, a very short pulse of light is used to excite a sample. Then the intensity of the fluorescence is recorded as a function of time. Suppose we study a dansyl fluorophore. The intensity of the fluorescent light versus time is as follows: Fluorescence intensity Time (ns) 1.1 x 104 4.9 x 103 5 2.3 x 103 10 1.3 x 103 15 5.6 x 102 20 Part A What is the observed fluorescence lifetime? Express your answer to two significant figures and include the appropriate units. T= 6.9 ns Submit Previous Answers Correct

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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.