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brianna0905

  • 2 years ago

A certain radioactive element has a half-life of one hour. If you start with 1.0 gram of the element at noon, how much of the radioactive element will be left at 2 p.m.? 0.50 grams 0.25 grams 0.125 grams 0.0 grams

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  1. chmvijay
    • 2 years ago
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    what you think :)

  2. brianna0905
    • 2 years ago
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    i think its 0.25g im not to sure

  3. chmvijay
    • 2 years ago
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    yaaa ur right see at 12 Pm or noon 1 gram is there since 1 hr is half time where it get converted to half of initial value at 1pm = 1/2 =0.5 gram then at 2 pm 0.5/2 =0.25 gram ur right :)

  4. brianna0905
    • 2 years ago
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    ohh hmm thought so, thank you!!(:

  5. chmvijay
    • 2 years ago
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    yw:)

  6. asmagul
    • 2 years ago
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    it is 0.25 as time is 2 hours then there are two half lives.1?2=0.5......0.5/2=0.25

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