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the half life for strontium-90 is 29 years. how many half-lives did the sample go through at the end of 87 year​
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the half life for strontium-90 is 29 years. how many half-lives did the sample go through at the end of 87 year​

User Thauburger
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= 87 : 29

= 3 half lives

User Taile
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