document.write( "Question 1163260: if you have an organic sample of C-14 weighing 220g, how long will it take to be reduced to 55g of C-14? \n" ); document.write( "
Algebra.Com's Answer #787307 by ikleyn(52835)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "One half life period for C-14 is  5730 years.\r\n" );
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document.write( "55 grams is exactly one-fourth  \"1%2F4\" = \"%281%2F2%29%5E2\"  of the original mass 220 grams of the sample.\r\n" );
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document.write( "Hence, 2 (two, TWO) half-life periods are needed,  or 2*5730 = 11460 years for the process.    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "There is a group of lessons in this site, which covers many similar problems on Carbon dating\r
\n" ); document.write( "\n" ); document.write( "    - Using logarithms to solve real world problems,  and\r
\n" ); document.write( "\n" ); document.write( "    - Carbon dating problems \r
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\n" ); document.write( "\n" ); document.write( "Also,  you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Logarithms\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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\n" ); document.write( "\n" ); document.write( "One important post-solution note.\r
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document.write( "    I do not know who is a composer of this problem - you or your professor or the third party,\r\n" );
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document.write( "    but I definitely know that this person DOES NOT know the basics of the underlying decay process and the decay dating method.\r\n" );
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document.write( "    In the natural organic samples, the initial ratio of the masses of radioactive C-14 to stable C-12 is  about  \"10%5E-12\".\r\n" );
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document.write( "    It is even less than tiny percent.\r\n" );
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document.write( "    Nevertheless, the existing measuring tools allow accurately measure this ratio.\r\n" );
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document.write( "    With time, the amount of C-14 decreases exponentially, and the ratio of masses  C-14 to C-12  decreases accordingly.\r\n" );
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document.write( "    In the dating method, ONLY THIS RATIO is the subject of measuring and consideration.\r\n" );
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document.write( "    Therefore, NOBODY and NEVER on the Earth had an organic 220 gram sample of C-14.\r\n" );
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\n" ); document.write( "\n" ); document.write( "So,  if you are going to publish this problem and my solution in some web-site,  I do not recommend you
\n" ); document.write( "to do it:   people will laugh on you.\r
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\n" ); document.write( "\n" ); document.write( "You better learn about the process from these authoritative sources\r
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\n" ); document.write( "\n" ); document.write( "https://www2.lbl.gov/abc/wallchart/chapters/13/4.html\r
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\n" ); document.write( "\n" ); document.write( "https://en.wikipedia.org/wiki/Radiocarbon_dating\r
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