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? asked in Education & ReferenceHomework Help · 6 days ago

After six half-lives have gone by, what fraction of a sample of a radioactive isotope remains?

2 Answers

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  • ?
    Lv 7
    6 days ago

    First half life ....... 1/2  remaining

    Second half life .. 1/4  remaining

    Third half life ...... 1/8  remaining

    Fourth half life .... 1/16 remaining

    Fifth half life ....... 1/32 remaining

    Sixth half life ...... 1/64 remaining

  • ?
    Lv 7
    6 days ago

    (1/2)^6  =  1/64   

    that's a fraction so you're down  

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