When a vertical beam of light passes through a transparent medium, the reason that its intensity I decreases is proportional to I(t), where t represents the thickness, in feet, of the medium. In clean sea water, the intensity at 3 feet  below the surface is 25% of the initial intensity I0  of the incident ray. What is the beam intensity at 15  feet below the surface?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter2: Working With Real Numbers
Section2.3: Rules For Addition
Problem 14P
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When a vertical beam of light passes through a transparent medium, the reason that its intensity I decreases is proportional to I(t), where t represents the thickness, in feet, of the medium. In clean sea water, the intensity at 3 feet 
below the surface is 25% of the initial intensity I
of the incident ray. What is the beam intensity at 15 
feet below the surface?

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