document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1088684>Question 1088684</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The intensity (I) of a radio signal varies inversely as the square of the distance (d) from the transmitter. If the intensity is 23 W/m^2 at a distance from the transmitter of 2 km, what is the intensity st a distance of 6 km? </SPAN>\n" );
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document.write( "The intensity (I) of a radio signal varies inversely as the square of the distance (d) from the transmitter. If the intensity is 23 W/m^2 at a distance from the transmitter of 2 km, what is the intensity st a distance of 6 km?<BR>\n" );
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document.write( "Solution:<BR>\n" );
document.write( "Given:<BR>\n" );
document.write( "I(d)=k/d^2   => k=I(d)*d^2<BR>\n" );
document.write( "23=k/2^2=k/4<BR>\n" );
document.write( "Need I(6).\r<BR>\n" );
document.write( "\n" );
document.write( "k=I(6)*6^2=23*2^2<BR>\n" );
document.write( "Solve for I(6)<BR>\n" );
document.write( "I(6)=(23*2^2)/6^2=23/9<BR>\n" );
document.write( "= 2.56 approx.<BR>\n" );
document.write( " <BR>\n" );
document.write( "Answer: the intensity at 6km is 2.56 W/m^2 </SPAN>\n" );
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