SOLUTION: The half-life of a particular radioactive isotope is 72 hours. Write an equation to relate the mass of radioactive material remaining to time (in hours). Starting with 170g,

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Question 1113943: The half-life of a particular radioactive isotope is 72 hours.
Write an equation to relate the mass of radioactive material remaining to time (in hours).
Starting with 170g, what mass will remain in 3 weeks?
If after one day (24 hours), a different sample of the material was found to have a mass of 14 mg with a half-life of 12h, what was the initial mass of the sample?
solve using log if possible

Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!
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The half-life of a particular radioactive isotope is 72 hours.
Write an equation to relate the mass of radioactive material remaining to time (in hours).
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If half life is 72 hours, then


This model then becomes
p, initial quantity
y, final quantity
t, time in hours

You can figure the other questions based on that.

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