Part 2: Rubidium-Strontium dating A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This is possible because 87Rb, which has a half-life of 4.75x1010 y, undergoes ß decay and becomes 87 Sr. The geologist determines that the ratio of 87 Sr to 87 Rb is 0.136. Assuming there was no 87 Sr in the rock when it was formed, determine the age of the rock. age of rock =

Part 2: Rubidium-Strontium dating A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This is possible because 87Rb, which has a half-life of 4.75x1010 y, undergoes ß decay and becomes 87 Sr. The geologist determines that the ratio of 87 Sr to 87 Rb is 0.136. Assuming there was no 87 Sr in the rock when it was formed, determine the age of the rock. age of rock =

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question 2 Currently a sample has a mixture of three isotopes A, B and C, with a ratio of 65:35:10 (A:B:C). Isotope A has a half-life of 3.75 x 105 years, isotope B has a half-life of 24110 years and isotope C has a half-life of 2.455 x 105 years. What was the % ratio 100,000 years ago?
The activity of a particular radioactive nuclide falls from 1 x 1011 Bq to 2 x 1010 Bq in 10 hours. Calculate the half life of the nuclide. A. 0.431 hours B. 4.31 hours C. 43.1 hours D. 431 hours
5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a. Write an exponential function to model this situation and define each variable. ( b. Determine what fraction of a sample of Krypton-85 will remain after 86.08 years. State the answer as an exact fraction value. ( C. Determine how long will it take for a sample of Krypton-85 to decay to 1/64 of its original mass. Round your answer to the nearest hundredth of a year.
solve for c)
Half-Life practice 2 What is half-life? 0 CALAFUER % of original mass remaining 100 90 80 70 60 50 40 30 20 10 51 Counts per minute 0 1 2 3 4 5 6 7 8 9 10 Number of half-lives 80 70 60 The graph below shows the breakdown of radon-222. 50 40 30 20 10 Create a graph that represents how a radioactive element will decay. 0 0 The half-life of Po-214 is 0.001 seconds. How much of a 10-gram sample is left after 0.003 seconds? 1 2 3 5 Time (Days) 4 6 7 8 9 10 Gold-198 has a half life of 2.7 days. Complete the table for an initial sample size of 200 grams. TIME ELAPSED 7 0 days 2.7 days AMOUNT REMAINING 200 grams How much of a 500g sample of potassium-42 is left after 37.2 hours if the half-life of potassium-42 is 12.4 hours. What is the half-life of Rn-222? What fraction of the original sample will be left after 3 half-lives?_ How much of a 100 gram sample of gold-198 is left after 8.10 days if its half life is 2.7 days? The Irendy Science Jeacher 2020
2) What is the threshold energy for the reaction Co+n→ Co+y? 3) The radioactive isotope (In-111) with physical half-life of 67.3 hours is used to study
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You inherit 32 kg of cesium-136 after your roommate moves out and leaves it behind. Cesium-137 has a half-life of 30 years. If you pack it in a box and forget about it, but your grandchildren finds it in the attic 90 years from now, how much of the sample is still cesium-137?
Question 4 Use the following data to calculate the binding energy per nucleon in MeV of the Rhodium-103 nuclide Mass of Rh atom = 102.905503 u 103 45 %3D Mass of proton = 1.007276 u Mass of neutron = 1.008664 u %3D Mass of electron = 0.00054858 u %3D 1u = 931.494 MeV [2.2] Question 5