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An electric light is placed directly over the center of a

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Reference no: EM13629230

An electric light is placed directly over the center of a circular plot of lawn 100m in diameter. Assuming that the intensity of light varies directly as the sine of the angle at which it strikes an illuminated surface, and inversely as the square of its distance from the surface, how high should the light be hung in order that the intensity may be as great as possible at the cicumference of the plot?

Reference no: EM13629230

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