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28 November, 13:59

After two hours, 1/16 of the initial amount of a certain radioactive isotope remains undecayed. The half-life of the isotope is:

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  1. 28 November, 14:06
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    The half life is 30 minutes.

    30 mins - 1/2 left

    60 mins - 1/4 left

    90 mins - 1/8 left

    120 mins - 1/16 left

    120 mins = 2 hours
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