The intensity I of light from an isotropic point source is determined as a function of distance

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The intensity I of light from an isotropic point source is determined as a function of distance r from the source. Figure gives intensity I versus the inverse square r-2 of that distance. The vertical axis scale is set by I s = 200 W/m2, and the horizontal axis scale is set by rs-2 = 8.0 m-2. What is the power of thesource?

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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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