198 The half-life of Au is 2-7 days. Calculate (a) the decay constant, (b) the average-life and (c) the activity of 1-00 mg of 198 198 Au. Take atomic weight of Au to be 198 g mol.
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- The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 6.2*10^2 Bq. The activity in a similar-sized sample of fresh wood is measured to be 1.1*10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.Plutonium-238 (238Pu) is a radioactive isotope with a half-life of 87.7 years. If a sample of 238Pu currently has an activity of 7000 decays/s, what was the activity 438.5 years (5 half-lives) ago?(a) 1.12×105 decays/s(b) 4.48×105 decays/s(c) 2.24×105 decays/s(d) 2.19×102 decays/s(e) 3.50×104 decays/sThe half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 6.1*10^3 Bq. The activity in a similar-sized sample of fresh wood is measured to be 6.9*10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.
- 8. A rock contains 120 umol of 238U (t1/2 = 2.5×10° yr) and 170 µmol of 206Pb. Assuming that all the 206pb comes from decay of the 238U, estimate the rock's age.A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 0.8 kg sample of carbon from the wood has an activity of 1550 decays per minute. Find the age of the charcoal. Living material has an activity of 15 decays/minute per gram of carbon present and the half-life of 14C is 5730 y. Answer in units of y.(2) What is the mass defect of a He atom if the atomic mass is 4.002603 amu? Answer: --- mass defect 0.030377 amu Am = (3) What mass of fuel must be consumed in a nuclear reactor to produce 36 x 10 Joules? (4) If 5 kg of fuel is consumed in a nuclear reactor how much energy is released?
- An ancient artifact is found to contain 240 g of carbon and has an activity of 479 decays/min. Part A Q Search What is the approximate age of the artifact, to the nearest thousand years? (The rate of decay of carbon in living matter is R 16 decays/(g. min).) Express your answer to the nearest thousand years. 15| ΑΣΦ Submit Part B What would its initial activity have been? Ro= Request Answer 15. ΑΣΦ P Pearson W ? ? y Copyright © 2022 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy | Permissions | Contact Us | decays/min Revie 10:02 AM 12/12/2022A particular rock is thought to be 234 million years old. If it contains 4.84 mg of 238U, how much 206 Pb should it contain? Assume 238U decays directly to 206PB with a half-life of 4.47 × 109 y.A 5 g sample of a radioactive element takes 102 days to reduce into 3 g. Calculate the half-life and identify the element.
- A sample of hypothetical element X decays by positron emission and has a half-life of 79 years. How many years are necessary for a sample of this radioisotope to be reduced by 79%? Answer to the nearest year.please solve question 3Tritium has a half-life of 12.3 years. Suppose there are initially 1.0 x 10^12 tritium atoms.(a) Calculate the initial activity in becquerel.(b) How many atoms remain after 123 years?