The intensity of light from a source is inversely proportional to its square of the distance from the source. If a pocketbook is 2.4 m from the lamp, the illumination on the page of the book is 500 lm/m2 (lumens per square meter). How far must the lamp be moved so that the intensity of light will be doubled?
The intensity of light from a source is inversely proportional to its square of the distance from the source. If a pocketbook is 2.4 m from the lamp, the illumination on the page of the book is 500 lm/m2 (lumens per square meter). How far must the lamp be moved so that the intensity of light will be doubled?
Chapter16: Electromagnetic Waves
Section: Chapter Questions
Problem 45P: The electric field of an electromagnetic wave traveling in vacuum is described by the following wave...
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The intensity of light from a source is inversely proportional to its square of the distance from the source. If a pocketbook is 2.4 m from the lamp, the illumination on the page of the book is 500 lm/m2 (lumens per square meter). How far must the lamp be moved so that the intensity of light will be doubled?
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