If 3.0 grams of Strontium-90 in a rock sample remained in 1989, approximately how many grams of Strontium-90 were present in the original sample in 1933? Half life of Strontium -90 is 28.1 years.

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Q: Strontium-90 is radioactive and has a half life of 28.8 years. What percentage of a sample would be…

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A: GIVEN:  To Find: Solution: As we know, For First order decay

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Q: what is the energy deposited by an alpha particle while passing through a cell of size 10 μ

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A: Applying basic concept of radioactivity.