mekahlaab mekahlaab

15-05-2019
Chemistry

contestada

A radioactive isotope of radium (Ra-226) has a half life of 1620 years. How much of this isotope remains after three (3) half-lives
1/8
None
1/4
1/2

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Аноним Аноним

15-05-2019

your answer should be “A.”

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