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OpenStudy (anonymous):
Intensity, I, of light received at a source varies inversely as the square of the distance, d, from the source. If the light intensity is 91 ft-candles at 18ft, find the intensity at 9ft. I=k/d^2
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OpenStudy (amistre64):
91 = k/(18^2) 91(18^2) = k l = 91(18^2)/(9^2)
OpenStudy (amistre64):
l = 91(18/9)^2 l = 91(2)^2 l = 91(4)
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