document.write( "Question 1109469: At what distance from a source of light will the intensity of illumination be half as great as it is at a distance of 6 inches \n" ); document.write( "
Algebra.Com's Answer #724472 by Alan3354(69443)\"\" \"About 
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At what distance from a source of light will the intensity of illumination be half as great as it is at a distance of 6 inches
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\n" ); document.write( "I = k/d^2 --- k = a constant.
\n" ); document.write( "d^2 = k/I
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\n" ); document.write( "d^2 = (k/(I/2)) = 2k/I
\n" ); document.write( "d = 6*sqrt(2) inches
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\n" ); document.write( "That might be confusing.
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\n" ); document.write( "Illumination intensity is a function of the inverse of the square of the distance.
\n" ); document.write( "d*2 = I/4
\n" ); document.write( "d*3 = I/9
\n" ); document.write( "d*x = I/x^2 --> d*sqrt(x) = I/x
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\n" ); document.write( "Inverse of the square of distance is common:
\n" ); document.write( "gravity, magnetism, E-field (of a point), sound intensity, and others.\r
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