Radioactive Parent Stable Daughter Product Half-life Potassium-40 Argon-40 1.25 billion yrs Rubidium-87 Strontium-87 48.8 billion yrs Thorium-232 Lead-208 14.1 billion yrs Uranium-235 Lead-207 713 million yrs Uranium-238 Lead-206 4.47 billion yrs Carbon-14 Nitrogen-14 5730 yrs 1. How many half-lives have elapsed to yield a sample with 125 atoms of C-14 and 375 atoms of N-14?   2. If the U-235:Pb-207 ratio in a zircon in a sandstone was found to be 1:3, how old is the zircon?   3. If the K-40:Ar-40 ratio in a zircon in a granite was found to be 1:7, how old is the sample?

Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter24: Nuclear Chemistry
Section: Chapter Questions
Problem 49A
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Radioactive Parent

Stable Daughter Product

Half-life

Potassium-40

Argon-40

1.25 billion yrs

Rubidium-87

Strontium-87

48.8 billion yrs

Thorium-232

Lead-208

14.1 billion yrs

Uranium-235

Lead-207

713 million yrs

Uranium-238

Lead-206

4.47 billion yrs

Carbon-14

Nitrogen-14

5730 yrs

1. How many half-lives have elapsed to yield a sample with 125 atoms of C-14 and 375 atoms of N-14?

 

2. If the U-235:Pb-207 ratio in a zircon in a sandstone was found to be 1:3, how old is the zircon?

 

3. If the K-40:Ar-40 ratio in a zircon in a granite was found to be 1:7, how old is the sample?

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