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Author Question: The diagram below shows the radioactive decay of cesium (135Cs). What is the half-life of 135Cs? ... (Read 68 times)

rl

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on: Jul 27, 2018
The diagram below shows the radioactive decay of cesium (135Cs). What is the half-life of 135Cs?
 
 

Question 2

The diagram below illustrates the radioactive decay of Potassium (40K), which has a half-life of 1.3 billion years. If a lunar rock is found that currently contains 5 grams of 40K, and it is determined that the sample contained 20 grams when it was formed, how old is the lunar rock?
 
 
   
  a.
  6.5 billion years
  b.
  19.5 billion years
  c.
  2.6 billion years
  d.
  3.9 billion years
  e.
  4.6 billion years


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blazinlyss

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Reply #1 on: Jul 27, 2018
Answer to Question 1

3 million years

Answer to Question 2

C


rl

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

helenmarkerine

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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