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Author Question: A rock sample containing an isotope with a half-life of 12 million years has an initial mass of 72 ... (Read 92 times)

sheilaspns

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on: Jul 13, 2018
A rock sample containing an isotope with a half-life of 12 million years has an initial mass of 72 grams. How much of the parent isotope will be present after three half-lives?
 A)4.5 grams
 B)9 grams
 C)18 grams
 D)54 grams
 E)63 grams

Question 2

Creep occurs only on weathered or soil-covered surfaces of moderate slope.
  Indicate whether the statement is true or false


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Zack0mack0101@yahoo.com

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Reply #1 on: Jul 13, 2018
Answer to Question 1

B

Answer to Question 2

False


sheilaspns

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Reply 2 on: Jul 13, 2018
Gracias!

nothere

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Reply 3 on: Yesterday
Excellent

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