levivader1063 levivader1063

18-03-2019
Advanced Placement (AP)

contestada

A radioactive isotope has a half-life of 40 years and a radioactivity level of 4 curies. How many years will it take for the radioactivity level to become 0.25?

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anikaraisa04 anikaraisa04

18-03-2019

it will take 160 years. >.<

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