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Author Question: A radioactive isotope has a half-life of one week. At the end of two weeks the amount remaining is ... (Read 69 times)

bobypop

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on: Jul 29, 2018
A radioactive isotope has a half-life of one week. At the end of two weeks the amount remaining is
 
  1) none,
  2) one-eighth,
  3) one-quarter,
  4) one-half,
 
  and at the end of three weeks the amount remaining is
  5) none.
  6) one-eighth.
  7) one-quarter.
  8) one-half.

Question 2

Radioactive isotope A has a half-life of one year, while radioactive isotope B has a half-life of one day. If equal numbers of atoms of each are present, which will give the highest reading on a Geiger counter?
 
  1) A
  2) B
  3) both the same
 
  How much of the original sample of radioactive isotope A will be left at the end of the second year?
  4) none
  5) one-quarter
  6) one-half
  7) one-eighth


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polinasid

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

Answer: 3, 6

Answer to Question 2

Answer: 2, 5


bobypop

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Reply 2 on: Jul 29, 2018
Gracias!

Jsherida

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

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