document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=32416>Question 32416</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The intensity of light L, measured in foot-candles, varies inversely as the square of the distance from the light d. if L=4/5 foot-candles when the distance is 20 feet.  Find the constant of variation and then find the intensity when the distance is 16 feet.\r<BR>\n" );
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document.write( "K=___________\r<BR>\n" );
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document.write( "answer________________ </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #18894 by </B><A HREF=/tutors/aboutme.mpl?userid=mukhopadhyay><B>mukhopadhyay(490)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mukhopadhyay><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=18894\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> L = k/d^2;<BR>\n" );
document.write( "=> k = Ld^2<BR>\n" );
document.write( "Using the values provided in the question,<BR>\n" );
document.write( "k = (4/5)*(20^2) = 400*4/5 = 320<BR>\n" );
document.write( "L = 320/(16^2) = 5/4;<BR>\n" );
document.write( "Answer: k = 320; Intensity for 16 feet distance = 5/4<BR>\n" );
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