document.write( "Question 461960: Astronomers can use the brihtness of two light sources,such as stars, to compare the distances from the light sources.The intensity , or brightness, of light I is inversely proportionnal to the square of the distance from the light source d.
\n" ); document.write( "a) rite an qution that represents this sititution.
\n" ); document.write( "b) if d is the independent variable and I is the dependent variable,graph the rqution from exercise a when k=16
\n" ); document.write( "c) if two people are viewing the same light source,and one person is three time the distance from the light source as the other person,compare the light intensities t
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Algebra.Com's Answer #316740 by stanbon(75887)\"\" \"About 
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Astronomers can use the brihtness of two light sources,such as stars, to compare the distances from the light sources.The intensity , or brightness, of light I is inversely proportionnal to the square of the distance from the light source d.
\n" ); document.write( "a) write an equation that represents this situation.
\n" ); document.write( "Ans: I = k/d^2
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\n" ); document.write( "b) if d is the independent variable and I is the dependent variable,graph the equation from exercise a when k=16
\n" ); document.write( "I = 16/d^2
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\n" ); document.write( "\"graph%28400%2C300%2C-10%2C10%2C-10%2C10%2C16%2Fx%5E2%29\"
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\n" ); document.write( "c) if two people are viewing the same light source,and one person is three times the distance from the light source as the other person,compare the light intensities t
\n" ); document.write( "--
\n" ); document.write( "intensity for person closer to sight source = k/d^2
\n" ); document.write( "intesity for person further away = k/(3d)^2
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\n" ); document.write( "Compare the two by dividing: [k/d^2]/[k/(3d)^2] = (k/d^2) = 9\r
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\n" ); document.write( "The intesity for the person closer to the light source
\n" ); document.write( "is 9 times as great as for the person further away from
\n" ); document.write( "the light source.
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\n" ); document.write( "Cheers.
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