Consider Atom A decays into Atom B with a half-life of 1.5 billion years and that...
Consider Atom A decays into Atom B with a half-life of 1.5 billion years and that new rocks start no atoms of type B.
A rock is found that has 7 times more Atom B than Atom A. How old is that rock?
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Consider Atom A decays into Atom B with a half-life of 1.5
billion years and that...
The half-life of Potassium-40 (K-40) decaying to Argon-40 (Ar-40) is 1.3 billion years. Suppose an igneous...
The half-life of Potassium-40 (K-40) decaying to Argon-40 (Ar-40) is 1.3 billion years. Suppose an igneous rock contains 105 million atoms of Ar-40 and 15 million atoms of K-40. (Assume here that no Ar-40 was present in the mineral when it formed and that no Ar-40 has escaped since formation). Using the number of half-lives from the previous question, how old is this rock? 2.6 billion years old 5.2 billion years old 3.9 billion years old 1.3 billion years old
A decomposition reaction has a half-life that is directly proportional to the initial concentration of the...
A decomposition reaction has a half-life that is directly proportional to the initial concentration of the reactant. What is the order of the reaction? Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 83.4% of the amount of uranium-238 that it contained when it was formed. (The amount that...
235U decays to 207Pb. 1. Which is the parent, U or Pb? 2. If 3 half...
235U decays to 207Pb. 1. Which is the parent, U or Pb? 2. If 3 half lives have passed, what is the parent daughter ratio? a) 50/50 b) 25/75 c) 12.5/87.5 d) 6.25/93.75 e) 3.125/96.875 3. The half life for 235U decay to 207Pb is 704 Ma. How old is the rock in the previous question? The half-life of 40K is 1.3 billion years. 4. If a 3.9 billion year old rock contains 100g of 40K, how many grams of...
Why can't we study sedimentary rocks that are older than about 3.7 Billion Years Old (byo)? O Rock older than 3.7 billion years has too much be considered sedimentary O The earth was not stable e...
Why can't we study sedimentary rocks that are older than about 3.7 Billion Years Old (byo)? O Rock older than 3.7 billion years has too much be considered sedimentary O The earth was not stable enough for life unti entary rock could not form until then because of a different carbon ratio We do! There is lots of sedimentary rock that is older 3.8 byo rocks in Hudson Bay for ins Canada. lithosphere of the earth (the crust) is being...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures. Part B If a sample of U−238 initially contained 1.5×1018 atoms when the universe was formed 13.8 billion years ago, how many U−238 atoms will it contain today? Express your answer using two significant figures.
Rubidium-87 decays by β production to strontium-87 with a half life of 4.7 × 1010 years....
Rubidium-87 decays by β production to strontium-87 with a half life of 4.7 × 1010 years. What is the age of a rock sample that contains 109.7 µg 87Rb and 4.0 µg 87Sr ? ___ years old Assume that no 87Sr was present when the rock was formed. Nuclide Atomic Mass 87Rb 86.90919 87Sr 86.90888
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in...
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 82.4% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock contained when it was formed can be deduced from the presence of the decay products of U−238.) How old is the rock?
Let's say that element X has a half-life of 7.5 million years before it becomes the...
Let's say that element X has a half-life of 7.5 million years before it becomes the daughter product, element Y. You find a rock that has 32 atoms of element Y for every atom of element X. How old is the rock? You must provide a numerical number( If your answer was 7 million years, then you would write 7 for your answer.) What is the "runaway greenhouse effect"? Why is it called "runaway"? Why is the runaway greenhouse effect...
The element does, however, have a very long half-life (7.92 billion years, or 7.92E9 years). If...
The element does, however, have a very long half-life (7.92 billion years, or 7.92E9 years). If a Stone originally contained 6.52E24 atoms of the unknown element when it formed during the Big Bang, how many atoms does it contain now, 13.8 billion years later (13.8E9 years)? 1.43E24 atoms 9.96E23 atoms 2.14E24 atoms 3.65E24 atoms 1.95E24 atoms 1-137, with 53 protons, undergoes beta minus decay. The daughter atom then undergoes beta minus decay again. Which of the following is the second...
Why can't we study sedimentary rocks that are older than about 3.7 Billion Years Old (byo)?...
Why can't we study sedimentary rocks that are older than about 3.7 Billion Years Old (byo)? A. Rock older than 3.7 billion years has too much graphite for it to be considered sedimentary. B. We do! There is lots of sedimentary rock that is older than 3.7 byo, for instance, 3.8 byo rocks in Hudson Bay, Canada. C. The earth was not stable enough for life until about 3.7 byo meaning sedimentary rock could not form until then because of...
The half-life of Potassium-40 (K-40) decaying to Argon-40 (Ar-40) is 1.3 billion years. Suppose an igneous rock contains 105 million atoms of Ar-40 and 15 million atoms of K-40. (Assume here that no Ar-40 was present in the mineral when it formed and that no Ar-40 has escaped since formation). Using the number of half-lives from the previous question, how old is this rock? 2.6 billion years old 5.2 billion years old 3.9 billion years old 1.3 billion years old
235U decays to 207Pb. 1. Which is the parent, U or Pb? 2. If 3 half lives have passed, what is the parent daughter ratio? a) 50/50 b) 25/75 c) 12.5/87.5 d) 6.25/93.75 e) 3.125/96.875 3. The half life for 235U decay to 207Pb is 704 Ma. How old is the rock in the previous question? The half-life of 40K is 1.3 billion years. 4. If a 3.9 billion year old rock contains 100g of 40K, how many grams of...
Why can't we study sedimentary rocks that are older than about 3.7 Billion Years Old (byo)? O Rock older than 3.7 billion years has too much be considered sedimentary O The earth was not stable enough for life unti entary rock could not form until then because of a different carbon ratio We do! There is lots of sedimentary rock that is older 3.8 byo rocks in Hudson Bay for ins Canada. lithosphere of the earth (the crust) is being...
The element does, however, have a very long half-life (7.92 billion years, or 7.92E9 years). If a Stone originally contained 6.52E24 atoms of the unknown element when it formed during the Big Bang, how many atoms does it contain now, 13.8 billion years later (13.8E9 years)? 1.43E24 atoms 9.96E23 atoms 2.14E24 atoms 3.65E24 atoms 1.95E24 atoms 1-137, with 53 protons, undergoes beta minus decay. The daughter atom then undergoes beta minus decay again. Which of the following is the second...
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