College Physics
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If an animal lived near and died in the LaBrea Tar Pits (found now in Los Angeles, California) 40,000 years ago, could Carbon-14 be used to determine when it died?
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- A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of tin in these samples: isotope 118 "Sn 120 Sn Use these measurements to complete the entry for tin in the Periodic Table that would be used on 98765 ALEKS. Be sure your answers have the correct number of significant digits. Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for tin in the Periodic Table we use here on Earth. 0 Sn mass relative (amu) abundance 117.9 54.% 0 119.9 Continue 46.% X S evee muuraw Hill LLC. All Rights Reserved. Submit Assignment Terms of Use | Privacy Center Accessibilityarrow_forwardWhat are the nuclear reactions taking place to produce radioactive tracers that are used in PET Scanners?arrow_forwardExplain how "carbon dating" is used to establish the age of once living things.arrow_forward
- Modern household smoke detectors contain a tiny speck of the element Americium (Am, atomic number 95, atomic mass 241), which has a half-life of 432 years and an activity of (roughly) of 37,000 decays per second. a) What is the approximate mass of this speck? (Hint: the atomic mass of this isotope is approximately 241.06 u). b) This isotope is an alpha emitter. Is its radiation likely to be a hazard to the household members while the smoke detector is on the ceiling? Explain.arrow_forwardRadioactive decay is always a first-order kinetic process. Uranium-238 decays to lead-206,which is stable, with an effective half-life of 4.51 billion years. Sediment from the oceancontains 0.00150 grams uranium-238 and 4.60 x 10-4 grams lead-206. Assume lead-206 isformed only by uranium-238 decay, and there was no lead-206 present when the sedimentformed; estimate the age of the sediment.arrow_forwardAssume you found a radioactive isotope that has a 1 million year half-life in an "old" bone. If you were to measure a 20% "parent" to 80% "daughter" ratio, how old is the bone? How would a bone twice as big change the count rate and the half-life?arrow_forward
- A skull fragment from an archeological dig is found to have an activity per gram of carbon that is about 6.3 % of what is found in currently living people. If the half-life of C-14 is 5730 years about how long ago was this person alive? a) 18,000 years ago b) 23,000 years ago c) 29,000 years ago d) 34,000 years ago e) 40,000 years agoarrow_forwardMeihui is at NASA analyzing Moon rocks. In one of the rocks from the lunar highlands, he discovered 49 % of the original uranium-238 remains, while remaining amount of uranium-238 had decayed into lead. The half life of uranium-238 is 4.5 × 109 years. Assume the only decay product is lead. How old is the lunar maria rock in billions of years (109 years)?arrow_forwardA fossil is found that contains 6.25% as much Radium-226 as fossils being formed today. The half-life of Radium -226 is 1.60 x103 years. How old is the fossil? Hint: How many half-lives did the Radium-226 go through for 6.25% to remain? So, how many years have passed over 4 half lives?arrow_forward
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