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Students derive the equation relating the intensity of light at a given point to the distance of that point from the light source.
Students derive the relationship between light intensity and distance from the light source. They begin by writing and graphing the equation relating the surface area of a sphere to the radius of the sphere.
Next, they derive the equation for light intensity as a function of the power of the light source and the distance from the source. They graph this function as well.
Finally, they use the graph of intensity vs. radius to solve some problems about the power of an unknown light source.
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