document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=334464>Question 334464</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The half-life of radium 226 is 1620 years. If we start with 20 grams of the element; find a model for radium and then use the model to calculate how much will be left after 1000 years.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #239631 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=239631\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The half-life of radium 226 is 1620 years. If we start with 20 grams of the element; find a model for radium and then use the model to calculate how much will be left after 1000 years.<BR>\n" );
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document.write( "A(t)= Ao*(1/2)^(t/1620)<BR>\n" );
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document.write( "A(1000) = 20*(1/2)^(1000/1620)<BR>\n" );
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document.write( "A(1000) = 20*(1/2)^0.6173<BR>\n" );
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document.write( "A(1000) = 20*0.6519<BR>\n" );
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document.write( "A(1000) = 13.0379 grams<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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