SOLUTION: The half-life of strontium -90 is 28 years. How much of a 10-g sample will remain after: a) 1 year? b) 10 years?

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Question 1149578: The half-life of strontium -90 is 28 years. How much of a 10-g sample will remain after:
a) 1 year?
b) 10 years?
Found 2 solutions by ikleyn, Alan3354:
Answer by ikleyn(52798) About Me  (Show Source):
You can put this solution on YOUR website!
.

The general formula is


    M = M0/(2^(t/28)),


Where M0 is the initial mass;  M is the current (remaining) mass, and "t" is time in years.



So, the answers (and the calculation work) are


(a)  M = 10/(2^(1/28)) = 9.755 grams;


(b)  M = 10/(2^(10/28)) = 7.807 grams.


Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The half-life of strontium-90 is 28 years. How much of a 10-g sample will remain after:
a) 1 year?
b) 10 years?
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Sub 28 for 98 in the calculations by Ikleyn.