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Author Question: If the amount of radioactive element is 1/8 of the amount originally present, how many half-lives ... (Read 181 times)

Frost2351

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on: Jul 16, 2018
If the amount of radioactive element is 1/8 of the amount originally present, how many half-lives have gone by? Please show your work.
 
  What will be an ideal response?

Question 2

Which is younger  rock unit X or B?
 
  What will be an ideal response?


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cam1229

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Reply #1 on: Jul 16, 2018
Answer to Question 1

P=Parent, D = Daughter, HL = Half-lives

P D HL
1 0 0
1/2 1/2 1
1/4 3/4 2
1/8 7/8 3
The answer is 3 half-lives have gone by.

Answer to Question 2

B is younger, otherwise it could not include pieces of X, which must have formed first.


Frost2351

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Reply 2 on: Jul 16, 2018
Wow, this really help

JaynaD87

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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