The half-life of a radioactive isotope is 1 h. (a) what fraction of a sample would e left after 3 h: (1) one third, (2) one eight, or 93) on ninth?

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The half-life of a radioactive isotope is 1 h. (a) what fraction of a sample would e left after 3 h: (1) one third, (2) one eight, or 93) on ninth? Why? (b) what fraction of a sample would be left after 1 day? 

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