The 87Rb rubidium isotope is used to determine the age of rocks and fossils. 87Rb is...
The 87Rb rubidium isotope is used to determine the age of rocks and fossils. 87Rb is β-active with a half-life of 4.9 to 1010 years and is degraded to strontium isotope 87Sr. The fossil under study contains strontium in the ratio k = NSr / NRb = 0.0055. Calculate the age of the fossil by assuming that strontium was not present when the fossil was petrified. Give the answer in years (ie a).
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is the most common isotope of rubidiumAdd Answer to:
The 87Rb rubidium isotope is used to determine the age of rocks and fossils. 87Rb is...
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
Rubidium-87 decays by ß production to strontium-87 with a half life of 4.7 x 1010 years....
Rubidium-87 decays by ß production to strontium-87 with a half life of 4.7 x 1010 years. What is the age of a rock sample that contains 104.9 ug 7Rb and 4.3 ug 87Sr? years old Assume that no 87Sr was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87Rb 86.90919 87Sr 86.90888
1010 years. What is the age of a rock sample that contains 1042 ug Rubidum 87...
1010 years. What is the age of a rock sample that contains 1042 ug Rubidum 87 decays by β production to strontium-87 with a half life of 4.7 87Rb and 4.3 μg 87Sr ? years old Assume that no 87Sr was present when the rock was fomed The atomic masses are given in the table below: Nuclide Atomic Mass 87Rb 86.90919 87Sr 86.90888
WILL RATE CORRECT ANSWERS CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life...
WILL RATE CORRECT ANSWERS
CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 1010 years. What is the age of a rock sample that contains 109.4 ug 87Rb and 5.5 87Sr? ug years old Assume that no 87 Sr was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87 RB 86.90919 87$ 86.90888
CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 1010...
CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 1010 years. What is the age of a rock sample that contains 109.8 ug 87Rb and 4.8 ug 87 1Sr? years old Assume that no 875r was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87Rb 86.90919 8781 86.90888 Submit Show Hints
21.42 for the beta decay of 130TI? OBJECTIVE Determine the ages of samples of matte from...
21.42
for the beta decay of 130TI? OBJECTIVE Determine the ages of samples of matte from radioactive decay data. 21.41 A sample of uranium ore contains 6.73 mg 238U and 3.22 ,206Pb. Assuming that all of the 206Pb arose from decay mg of the 238U and that the half-life of 23U is 4.51 × 10° years, determine the of the ore. age 21.42 A tree was cut down and used to make a statue 2300 vears ago. What fraction of...
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...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...
Rubidium-87 decays by ß production to strontium-87 with a half life of 4.7 x 1010 years. What is the age of a rock sample that contains 104.9 ug 7Rb and 4.3 ug 87Sr? years old Assume that no 87Sr was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87Rb 86.90919 87Sr 86.90888
1010 years. What is the age of a rock sample that contains 1042 ug Rubidum 87 decays by β production to strontium-87 with a half life of 4.7 87Rb and 4.3 μg 87Sr ? years old Assume that no 87Sr was present when the rock was fomed The atomic masses are given in the table below: Nuclide Atomic Mass 87Rb 86.90919 87Sr 86.90888
WILL RATE CORRECT ANSWERS
CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 1010 years. What is the age of a rock sample that contains 109.4 ug 87Rb and 5.5 87Sr? ug years old Assume that no 87 Sr was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87 RB 86.90919 87$ 86.90888
CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 1010 years. What is the age of a rock sample that contains 109.8 ug 87Rb and 4.8 ug 87 1Sr? years old Assume that no 875r was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87Rb 86.90919 8781 86.90888 Submit Show Hints
21.42
for the beta decay of 130TI? OBJECTIVE Determine the ages of samples of matte from radioactive decay data. 21.41 A sample of uranium ore contains 6.73 mg 238U and 3.22 ,206Pb. Assuming that all of the 206Pb arose from decay mg of the 238U and that the half-life of 23U is 4.51 × 10° years, determine the of the ore. age 21.42 A tree was cut down and used to make a statue 2300 vears ago. What fraction of...
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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