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anonymous

  • 5 years ago

At the beginning of an experiment, a scientist has 112 grams of radioactive goo. After 225 minutes, her sample has decayed to 14 grams. What is the half-life of the goo in minutes? Find a formula for , the amount of goo remaining at time.? How many grams of goo will remain after 26 minutes?

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  1. amistre64
    • 5 years ago
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    14 = 112e^(225r) 14 ---- = e^(225r) 112 ln(1/8) = 225r r = ln(1/8)/225 ................................... y = 112e^(ln(1/8)/225)t lol

  2. amistre64
    • 5 years ago
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    112/2 = 56 56 ---- = 1/2 ..... im getting dumber by the minute lol 112 ln(1/2) ------ = halftime rate

  3. amistre64
    • 5 years ago
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    half-life = 75 minutes

  4. amistre64
    • 5 years ago
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    and im thinking 8' 2/3 after 26 minutes

  5. amistre64
    • 5 years ago
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    but that last part is prolly wrong

  6. amistre64
    • 5 years ago
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    http://www.wolframalpha.com/input/?i=112+e^%28%28ln%281%2F8%29%2F225%29x%29+at+x%3D26 thats better

  7. anonymous
    • 5 years ago
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    lol ur fine i thank you for trying and helping:)

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