The intensity i of light from a bulb is inversely proportional to the square of the distances from the bulb. If I = 90 W/m2 (Watts per square meter) when the distance s = 20 m, find the intensity at a distance s= 10 m.
The intensity i of light from a bulb is inversely proportional to the square of the distances from the bulb. If I = 90 W/m2 (Watts per square meter) when the distance s = 20 m, find the intensity at a distance s= 10 m.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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1. The intensity i of light from a bulb is inversely proportional to the square of the distances from the bulb. If I = 90 W/m2 (Watts per square meter) when the distance s = 20 m, find the intensity at a distance s= 10 m.
2. 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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