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30-12-2019
Physics

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An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39 percent.1.What is the half-life of the element?2.How long will it take for a sample of 100 mg to decay to 46 mg?

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Henryonuoha2018 Henryonuoha2018

31-12-2019

Answer: Half life is 588.96 days

Anf It will take 659.81 days for a 100 mg sample to decay to 46 mg.

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