8. What is the half-life of Potassium-40? 125 billion years9. What is the stable daughter product of Potassium-40? Argon - 4010. Why is this daughter product from #9 sometimes problematic to measure?11. Figure 11.16 shows that Uranium-238 decays to many daughters. What stable daughter product doesUranium and Thorium eventually decay to?12. What is the full name of what Uranium-238 decays to immediately after Radium-226? (You mayalso need Figure 2.5!)Baden-22213. The daughter product in #12 has a half-life of only 3.8 days and is a gas. However, it can bedangerous if it is in high concentrations in your house, especially your basement. Why?14. If a rock containing a radioactive parent isotope with a half-life of 25 Ma can be shown to have gonethrough 4 half-lives, how old is the rock?15. If a rock containing a radioactive parent isotope with a half-life of 128 Ma is calculated to be only32 Ma old, how many half-lives has the rock gone through?16. If one begins with 3200 atoms of a radioactive parent isotope, how many atoms of that isotope willremain after 3 half-lives have passed?The Geologic Time Scale - Use the approved ICS time scale only and include units17. If a rock layer has a radiometric date of 380 Ma, what geologic period does it belong in?18. How long is the absolute time span of the Cambrian Period?19. What time (in years) marks the beginning of the Neogene Period?20. In what era is the Triassic Period?

Answered: 8. What is the half-life of…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Question

8. What is the half-life of Potassium-40? 125 billion years
9. What is the stable daughter product of Potassium-40? Argon - 40
10. Why is this daughter product from #9 sometimes problematic to measure?
11. Figure 11.16 shows that Uranium-238 decays to many daughters. What stable daughter product does
Uranium and Thorium eventually decay to?
12. What is the full name of what Uranium-238 decays to immediately after Radium-226? (You may
also need Figure 2.5!)
Baden-222
13. The daughter product in #12 has a half-life of only 3.8 days and is a gas. However, it can be
dangerous if it is in high concentrations in your house, especially your basement. Why?
14. If a rock containing a radioactive parent isotope with a half-life of 25 Ma can be shown to have gone
through 4 half-lives, how old is the rock?
15. If a rock containing a radioactive parent isotope with a half-life of 128 Ma is calculated to be only
32 Ma old, how many half-lives has the rock gone through?
16. If one begins with 3200 atoms of a radioactive parent isotope, how many atoms of that isotope will
remain after 3 half-lives have passed?
The Geologic Time Scale - Use the approved ICS time scale only and include units
17. If a rock layer has a radiometric date of 380 Ma, what geologic period does it belong in?
18. How long is the absolute time span of the Cambrian Period?
19. What time (in years) marks the beginning of the Neogene Period?
20. In what era is the Triassic Period?

Expert Solution

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Answer 8:

Isotope: Atomically identical but chemically distinct elements are referred to as isotopes. Three isotopes of potassium exist here. With a lengthy half-life of 1.25 billion years, potassium-40 (40K) is a radioactive isotope of potassium. It accounts for around 0.012% (120 ppm) of the total potassium present in nature.

The half-life will be 1.19X1010 years, if potassium-40 decays by positron emission.

Answer 9:

The majority of the earth's crust naturally contains the weakly radioactive 40K, which has a half-life of 1250 million years and decays to two daughters, 40Ar and 40Ca. Because 40Ar is insoluble in molten rock, lava flows have a zeroing mechanism.

the stable daughter product of Potassium-40 is Argon 40.