Intensity of illumination The intensity of illumination I
Chapter 3, Problem 3.5.20(choose chapter or problem)
Intensity of illumination The intensity of illumination I from a source of light varies inversely as the square of the distance d from the source.(a) Express I in terms of d and a constant of variation k. (b) A searchlight has an intensity of 1,000,000 candlepower at a distance of 50 feet. Find the value of k in part (a).(c) Sketch a graph of the relationship between I and d for(d) Approximate the intensity of the searchlight in part (b) at a distance of 1 mile.
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