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A radioactive substance has a half-life of 30 minutes. After 1 hour, what fraction of the substance will remain? O 1/4 O 3/4 O 1/8

A radioactive substance has a half-life of 30 minutes. After 1 hour, what fraction of the substance will remain? O 1/4 O 3/4 O 1/8 O 1/2

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