SOLUTION: An isotope of strontium, Sr-90, has a half-life of 25 year. Find the mass of Sr-90 remaining from a sample of 18mg after 125 years

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Question 1173758: An isotope of strontium, Sr-90, has a half-life of 25 year. Find the mass of Sr-90 remaining from a sample of 18mg after 125 years
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
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125 years is 5 (five) half-lives.


THEREFORE, the remaining sample mass after 125 years will be  %281%2F2%29%5E5%2A18 mg = 18%2F2%5E5 mg = 18%2F32 mg = 9%2F16 mg = 0.5625 mg.    ANSWER

Solved.

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To learn more on the subject,  look into the lesson
    - Radioactive decay problems
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lesson is the part of this online textbook under the topic "Logarithms".


Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
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to your archive and use it when it is needed.