document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1197601>Question 1197601</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The half life of a certain isotope is 8.5. If we we have a sample of 10 ounces of isotope   show much of it will remain after one full day. One of 4 choices is the answer.  0.28 ounces, 0<BR>\n" );
document.write( "14 ounces, 1.41 ounces, or 2.83 ounces. Which answer is correct? </SPAN>\n" );
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document.write( "Obviously the post is made carelessly, without a time unit on the half life.  But given the answer choices, we can determine logically what those units are.<br><BR>\n" );
document.write( "We start with 10 ounces, and the answer choices for the amounts remaining after 1 day (24 hours) are between 0.28 and 2.83 ounces.  Since the amount of the isotope decreases by 1/2 every half life, 24 hours has to be approximately 3 to 4 half lives; that means the given half life of \"8.5\" is in fact 8.5 hours.<br><BR>\n" );
document.write( "So the number of half lives is 24/8.5, and the amount remaining after 24 hours is, to 2 decimal places, is<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%28%281%2F2%29%5E%2824%2F8.5%29%29=1.41 ALIGN=MIDDLE  ALT=\"10%28%281%2F2%29%5E%2824%2F8.5%29%29=1.41\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );