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 Mariam_6809 #1 Posted : Tuesday, June 08, 2021 12:35:11 AM Rank: NewbieGroups: Registered Joined: 5/27/2021Posts: 5Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) Hi! I am a little confused about how I should go about doing 15. I know we took it up in class, but my wifi glitched thus I missed it. Back to top User Profile
 INSTR_Katrina_128 #2 Posted : Tuesday, June 08, 2021 6:39:17 PM Rank: Advanced MemberGroups: Registered Joined: 5/18/2021Posts: 73Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) Was this perhaps Review Question 15 on page 60 of the Classroom Companion?In the passage, we are told that the half life of carbon-14 is 5730 years. Let's round that to 5700 years for easier math.Let's assume today is today! Wow.If we start with 100% carbon-14, then in 5700 years, we will have 50% carbon-14. In another 5700 years (or a total of 11400 years), we will have 25% carbon-14. In another 5700 years (or a total of 17100 years), we will have 12.5% carbon-14.In summary:100% remaining - 0 years50% remaining - 5700 years25% remaining - 11400 years12.5% remaining - 17100 yearsWe are told that a fossil contains 20% carbon-14.It must have a lifespan between 11400 and 17100 years.The answer is EITHER B or C. A and D are eliminated.Since 20% is approximately halfway between 25% and 12.5%, then the lifespan should be approximately halfway between 11400 and 17100 years. So, C is the best answer! Back to top User Profile
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