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Author Question: A rock sample contains 1/4 micrograms of the parent radioactive isotope K-40 and 3/4 micrograms of ... (Read 84 times)

OSWALD

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on: Jul 27, 2018
A rock sample contains 1/4 micrograms of the parent radioactive isotope K-40 and 3/4 micrograms of its daughter isotope Ar-40. If the half-life of this decay is 1.25 billion years, how old is this rock?
 
  A) 5.00 billion years
  B) 3.75 billion years
  C) 1.25 billion years
  D) 2.50 billion years

Question 2

Starting from rest, a proton falls through a potential difference of 1.2 kV. What speed does it acquire?
 
  What will be an ideal response?


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kardosa007

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

D

Answer to Question 2

4.8  105 m/s


OSWALD

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Reply 2 on: Jul 27, 2018
Gracias!

peter

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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