UNDERSTANDING THE UNIVERSE(LL)-W/CODE
3rd Edition
ISBN: 9780393869903
Author: PALEN
Publisher: NORTON
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Chapter 6, Problem 40QAP
(a)
To determine
The reason why carbon 14 is not used to determine the age of the solar system.
(b)
To determine
The decay amount of rubidium-87
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You want to use radiometric dating to determine the age of a specimen. You use Isotope Z, which has a half-life of 645 years. You measure your sample and find that 1/16 of the original amount of Isotope Z is present. How old is the sample?
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Chapter 6 Solutions
UNDERSTANDING THE UNIVERSE(LL)-W/CODE
Ch. 6.1 - Prob. 6.1CYUCh. 6.2 - Prob. 6.2CYUCh. 6.3 - Prob. 6.3CYUCh. 6.4 - Prob. 6.4CYUCh. 6.5 - Prob. 6.5CYUCh. 6 - Prob. 1QAPCh. 6 - Prob. 2QAPCh. 6 - Prob. 3QAPCh. 6 - Prob. 4QAPCh. 6 - Prob. 5QAP
Ch. 6 - Prob. 6QAPCh. 6 - Prob. 7QAPCh. 6 - Prob. 8QAPCh. 6 - Prob. 9QAPCh. 6 - Prob. 10QAPCh. 6 - Prob. 11QAPCh. 6 - Prob. 12QAPCh. 6 - Prob. 13QAPCh. 6 - Prob. 14QAPCh. 6 - Prob. 15QAPCh. 6 - Prob. 16QAPCh. 6 - Prob. 17QAPCh. 6 - Prob. 18QAPCh. 6 - Prob. 19QAPCh. 6 - Prob. 20QAPCh. 6 - Prob. 21QAPCh. 6 - Prob. 22QAPCh. 6 - Prob. 23QAPCh. 6 - Prob. 24QAPCh. 6 - Prob. 25QAPCh. 6 - Prob. 26QAPCh. 6 - Prob. 27QAPCh. 6 - Prob. 28QAPCh. 6 - Prob. 29QAPCh. 6 - Prob. 30QAPCh. 6 - Prob. 31QAPCh. 6 - Prob. 32QAPCh. 6 - Prob. 33QAPCh. 6 - Prob. 34QAPCh. 6 - Prob. 35QAPCh. 6 - Prob. 36QAPCh. 6 - Prob. 37QAPCh. 6 - Prob. 38QAPCh. 6 - Prob. 39QAPCh. 6 - Prob. 40QAPCh. 6 - Prob. 41QAPCh. 6 - Prob. 42QAPCh. 6 - Prob. 43QAPCh. 6 - Prob. 44QAPCh. 6 - Prob. 45QAP
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- An isotope of a radioactive element has half-life equal to 5 thousand years. Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 20 percent of the initial quantity of the isotope remaining. How old is the sample? Give your answer in thousands of years, correct to one decimal place. Age : ___ thousand years.arrow_forwardThe half-life of Carbon-13 is 5750 years. Samples taken at an excavation site show that a one-kilogram sample has 65% Carbon-13 as compared to a normal sample. What is the age of the sample?arrow_forwardA sample of carbon-14 has a mass of 2.0 × 10–6 g. Carbon-14 has a half-life of 6000 years. How much carbon-14 will be left after 24 000 years? How would I sovle this?arrow_forward
- One of the fossilized remains of the Taong Tabon you found contains 153 grams of Carbon-14 at time t = 0. If the half-life of Carbon-14 is 5 730 years, how much Carbon-14 remains after 500 years?arrow_forwardA piece of fossilized wood has a carbon 14 radioactivity that is one eighth that of new wood. The half-life of carbon-14 is 5730 years how old is the wood?arrow_forwardA fossil contains 4.06 grams of carbon 14. Refer to the formulaA(t) = C 0.999879t which gives the original amount of carbon 14 t years ago in terms of the amount C that is left now, and estimate the amount of carbon 14 in the sample 10,000 years, 20,000 years, and 30,000 years ago. (Round your answers to one decimal place.arrow_forward
- Charan is at NASA analyzing Moon rocks. In one of the rocks from the lunar highlands, he discovered 37 % 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_forwardUranium, an important component of both nuclear weapons and nuclear reactors, has two major isotopes—U-238, which has a half-life of approximately 4.5 billion years, and U-235, which has a half-life of approximately 700 million years. Both were present in equal amounts at the time of the creation of the Earth, 4.5 billion years ago. How many billion years after the creation of the Earth had the amount of radiation from uranium decayed to half the amount present at the time of the creation of the Earth? (Round your answer to the nearest hundredth of a billion years.)arrow_forwardif the half life of uranium 235 is 700 million years and you have 64 atoms of it, how many 700 million year units of time will pass before 1 atom of uranium 235 is left?arrow_forward
- You analyze a sample of a meteorite that landed on Earth and find that 7/8 of the uranium-238 radioactive atoms have decayed into lead-206. What is the age of the sample (in years) if the half-life of uranium-238 is 4.5 billion years?arrow_forwardC^14, a form of carbon that is used to find the age of fossils has a half life of 5730 years. how much of a 10 gram sample is left after 13,000 years?arrow_forwardRock B was found to contain 6 atoms of a parent isotope and 94 atoms of its daughter isotope. If the half-life of the parent- daughter isotope pair is 2 million years, what is the absolute age of Rock B? Parent atoms remaining 100 94 atoms 87 atoms 80 75 atoms 60 50 atoms 40 25 atoms 13 atoms 6 atoms 1 2 3 4 Number of half-lives (Elapsed time) 2 million years old 4 million years old 6 million years old 8 million years old 94 million years old LO 20 Number of atoms (percent)arrow_forward
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