Asked by Caitlyn

The half-life of strontium-90 is 28 years. How long will it take a 60 mg sample to decay to a mass of 15 mg?
Answered by MathMate
60 mg will decay to 30mg in 28 years.
Similarly, 30mg will decay to 15 mg in another 28 years.
Figure out the answer.
Answered by Yo mama
56 years I reckon
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