The isotope 40K can decay to either 40Ca or 40Ar; assume both decays have a half-life...
The isotope 40K can decay to either 40Ca or 40Ar; assume both decays have a half-life of 1.26 X 109 y. The ratio of the Ca produced to the Ar produced is 8.54/1=8.54. A sample originally had only 40K. It now has equal amounts of 40K and 40Ar; that is the ratio of K to Ar is 1/1=1. How old is the sample? (Hint: work this like other radioactive-dating problems, except that this decay has two products).
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The isotope 40K can decay to either 40Ca or 40Ar; assume both
decays have a half-life...
The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope,...
The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope, ^40K has a 1.28 billion year half-life and is naturally present at very low levels. ^40K decays by beta emission into ^40Ar. Argon is a gas, and there is no argon in flowing lava because the gas escapes. Once the lava solidifies, any argon produced in the decay of ^40K is trapped inside and cannot escape. A geologist brings you a piece of solidified...
The percent natural abundance of 40K is 0.0117%. The radioactive decay of 40K atoms occurs 89%...
The percent natural abundance of 40K is 0.0117%. The radioactive decay of 40K atoms occurs 89% by β− emission; the rest is by electron capture and β+ emission. The half-life of 40K is 1.26×109 years. Calculate the number of β− particles produced per second by the 40K present in a 1.49 g sample of the mineral microcline, KAlSi3O8.
The unstable isotope 40K is used for dating rock samples. Its half-life is 1.28×109y. How many...
The unstable isotope 40K is used for dating rock samples. Its half-life is 1.28×109y. How many decays occur per second in a sample containing 1.61×10−6 g of 40K? What is the activity of the sample in curies?
If a radioactive isotope has half-life h, then the number of atoms in a sample is...
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
(a) 40K, which can undergo both β+ and β-decay, decays by β-decay with a branching ratio of 89%. ...
(a) 40K, which can undergo both β+ and β-decay, decays by β-decay with a branching ratio of 89%. One gram of natural potassium (molar mass: 39.1 gm/mol) emits 1700 per minute from this decay, and 40K comprises 0.0118% of natural potassium. 10 Calculate the half-life of 40K b) Some of the particle interactions shown below are correct, others are incomplete (you may assume all are energetically possible). With the aid of the accompanying table of lepton properties, use conservation of...
A Radioactive Isotope is 1. Time for half of a sample to decay from parent isotope...
A Radioactive Isotope is 1. Time for half of a sample to decay from parent isotope to daughter isotope for radioactive atoms 2. The technique of getting the age of something by using unstable isotopes 3. An element that has unstable nuclei and will transform itself into another element 4. The process of an element transforming into another element by changes of its nucleus
Question 18 0 out of 1 points A radioactive isotope decays with a half-life of 8.02...
Question 18 0 out of 1 points A radioactive isotope decays with a half-life of 8.02 minutes. If a sample of the isotope initially contains 5.00 g, what mass remains after 6.01 minutes? Selected Answer. 3.13 g Answers 2.979 1.139 1.87 g 3.139
1. The half-life of carbon-14 is 5730 years. A sample is found to have one-eighth the...
1. The half-life of carbon-14 is 5730 years. A sample is found to have one-eighth the original amount of carbon-14 in it. How old is the sample? 5730 years, 716 years, 45800 years, 17200 years 2. Why wouldn't you use carbon-14 dating on a piece of shell that was estimated to be 1 million years old? Sea shells do not have radioisotopes, carbon dating is only useful on plants, uranium dating is better for items older than 1/2 million years,...
ReviewI Constants The technique known as potassium-argon dating is used to date volcanic rock and ash, and thus establish dates for nearby fossils like this hominid skull.(Figure 1) The potassi...
ReviewI Constants The technique known as potassium-argon dating is used to date volcanic rock and ash, and thus establish dates for nearby fossils like this hominid skull.(Figure 1) The potassium isotope "0K has a 1.28-billion-year half-life and is naturally present at very low levels. Its most common decay mode is beta-minus decay into the stable isotope 40 Ca, but 10.9% of its decays are beta-plus which result in the creation of the stable isotope 40 Ar. The high temperatures in...
39Cl decays by emitting a ?- particle. This decay process has a half-life of 5.56×101 min....
39Cl decays by emitting a ?- particle. This decay process has a half-life of 5.56×101 min. If the initial mass of a pure sample of this isotope is 8.47 µg, determine the number of 39Cl nuclei remaining after 6.010×102 min. Report your answer to three significant figures in scientific notation.
The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope, ^40K has a 1.28 billion year half-life and is naturally present at very low levels. ^40K decays by beta emission into ^40Ar. Argon is a gas, and there is no argon in flowing lava because the gas escapes. Once the lava solidifies, any argon produced in the decay of ^40K is trapped inside and cannot escape. A geologist brings you a piece of solidified...
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
(a) 40K, which can undergo both β+ and β-decay, decays by β-decay with a branching ratio of 89%. One gram of natural potassium (molar mass: 39.1 gm/mol) emits 1700 per minute from this decay, and 40K comprises 0.0118% of natural potassium. 10 Calculate the half-life of 40K b) Some of the particle interactions shown below are correct, others are incomplete (you may assume all are energetically possible). With the aid of the accompanying table of lepton properties, use conservation of...
Question 18 0 out of 1 points A radioactive isotope decays with a half-life of 8.02 minutes. If a sample of the isotope initially contains 5.00 g, what mass remains after 6.01 minutes? Selected Answer. 3.13 g Answers 2.979 1.139 1.87 g 3.139
ReviewI Constants The technique known as potassium-argon dating is used to date volcanic rock and ash, and thus establish dates for nearby fossils like this hominid skull.(Figure 1) The potassium isotope "0K has a 1.28-billion-year half-life and is naturally present at very low levels. Its most common decay mode is beta-minus decay into the stable isotope 40 Ca, but 10.9% of its decays are beta-plus which result in the creation of the stable isotope 40 Ar. The high temperatures in...
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