2. A wooden object from an archeological site is subjected to radiocarbon dating. The activity of the sample that is due to 14C is measured to be 11.6 disintegrations per second. The activity of a carbon sample of equal mass from fresh wood is 15.2 disintegrations per second. The half-life of 14C is 5715 yr. What is the age of the archeological sample?

2. A wooden object from an archeological site is subjected to radiocarbon dating. The activity of the sample that is due to 14C is measured to be 11.6 disintegrations per second. The activity of a carbon sample of equal mass from fresh wood is 15.2 disintegrations per second. The half-life of 14C is 5715 yr. What is the age of the archeological sample?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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All the disintegrations of a sample of an unknown nuclide weighing 4.6 x 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 x 1020. What is the atomic weight of the unknown element?
A radioactive isotope has an activity of 9.94×104 Bq initially. After 3.35 hours the activity is 5.96×104 Bq. What is the half-life of the isotope? What is the activity after an additional 3.35 hours?
A sample of bone is subjected to radiocarbon dating. The current decay rate observed for its carbon-14 content is 11.2 disintegrations per minute per gram of carbon. What is the age (in years) of the bone? The half-life for carbon-14 is 5.73 x 103 yrs, and the decay rate for carbon-14 in living organisms is 14.3 disintegrations per minute per gram of carbon.
The cloth shroud from around a mummy is found to have a 14C activity of 8.3 disintegrations per minute per gram of carbon as compared with living organisms that undergo 16.3 disintegrations per minute per gram of carbon. From the half-life for 14C decay, 5715 yr, calculate the age of the shroud.
A radioactive nuclide had an activity of 1.38 x 105 dpm 60 days ago, but now has an activity of 6.05 x 104 dpm. What is the half life?
A bone has a carbon-14 decay rate of 4.98 disintegrations per minute per gram of carbon. If a living organism has a decay rate of 15.3 disintegrations per minute per gram of carbon, how old is the bone? The half life of carbon-14 is 5715 years.
A wood carving is found in the excavation of an abandoned settlement. A sample from this carving is found to have a C-14 content that is 25.0% of that of living trees. How old is the object? The half-life of carbon 14 is 5730 years.
A volcanic eruption melts a large chunk of rock, and all gases are expelled. After cooling, argon-40 accumulates from the ongoing decay of potassium-40 (half-life of potassium-40 is 1.25 x 109 yr) in the rock. When a piece of rock is analyzed, it is found to contain 1.38 mmol of potassium-40 and 1.14 mmol of argon-40. How long ago did the rock cool?