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Author Question: If the half-life of some radioactive element is 1 billion years, and a mass of rock originally ... (Read 121 times)

joblessjake

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on: Jul 29, 2018
If the half-life of some radioactive element is 1 billion years, and a mass of rock originally contained 100 g of that element, how many grams of the radioactive element would be left after three billion years had passed?
 
  A) 6.25 g
  B) 12.5 g
  C) 25 g
  D) 50 g
  E) none

Question 2

The numerical dates associated with events on the geologic time scale were determined by
 
  A) relative dating.
  B) superposition.
  C) radiometric dating.
  D) fossil assemblages through time.


Christopher

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: E

Answer to Question 2

Answer: C


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joblessjake

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Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


Christopher

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Reply #3 on: Jul 29, 2018
Great! Please up vote :D


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