document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=457258>Question 457258</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A proposed city ordinance will make it illegal to create sound in a residential area that exceeds 72 decbels during the day and 55 decibels during the night .How many times as intense is the noise level allowed during the day than at night? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #313760 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=313760\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A proposed city ordinance will make it illegal to create sound in a residential area that exceeds 72 decibels during the day and 55 decibels during the night .How many times as intense is the noise level allowed during the day than at night?<BR>\n" );
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document.write( "M = 10log[I/Io]<BR>\n" );
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document.write( "72 = 10log[I/Io]<BR>\n" );
document.write( "log[I/Io] = 7.2<BR>\n" );
document.write( "I/Io = 10^7.2<BR>\n" );
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document.write( "I(72) = 10^7.2*Io<BR>\n" );
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document.write( "Same procedure gives:<BR>\n" );
document.write( "I(55) = 10^5.5*Io<BR>\n" );
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document.write( "Dividing I(72)/I(55) you get [10^7.2/10^5.5] = 10^1.7 = 60.12 as intense.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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