document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=323981>Question 323981</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain radioactive substance decays exponentially and has a half-life of 78 years.  What fraction of the substance will decay in 234 years? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #231870 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=231870\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A certain radioactive substance decays exponentially and has a half-life of 78 years. What fraction of the substance will decay in 234 years?<BR>\n" );
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document.write( "A(t) = Ao*(1/2)^(t/78)<BR>\n" );
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document.write( "A(234) = Ao*(1/2)^(234/78)<BR>\n" );
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document.write( "A(234) = Ao*0.125<BR>\n" );
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document.write( "Ans: 1/8 will be remaining;<BR>\n" );
document.write( "7/8 of the original amount will have decayed.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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