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anonymous

  • one year ago

Please help me have been trying to solve this problem for a while and its been very frustrating. Krypton-91 is a radioactive substance that decays very quickly. The function Q(t)=Qoe^-kt models the radioactive decay of krypton-91. Q represents the quantity remaining after t seconds, and the decay constant, k, is approximately 0.07. How long will it take a quantity of krypton-91 to decay to 10% of its original amount? Round your answer to the nearest second.

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  1. BioHazard9064
    • one year ago
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    new account?

  2. anonymous
    • one year ago
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    yeah

  3. anonymous
    • one year ago
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    thnks

  4. BioHazard9064
    • one year ago
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    to tell the truth it should show you what to do here. http://openstudy.com/study#/updates/5564be9ae4b0a3c430174bba

  5. BioHazard9064
    • one year ago
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    because I have no clue how to solve this

  6. anonymous
    • one year ago
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    ok thanks for trying is anyone else going to help me er...?

  7. BioHazard9064
    • one year ago
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    probley not

  8. BioHazard9064
    • one year ago
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    most of them are offline

  9. anonymous
    • one year ago
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    ok thnk u

  10. BioHazard9064
    • one year ago
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    well most 99s are ofline

  11. anonymous
    • one year ago
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    ;)

  12. triciaal
    • one year ago
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    |dw:1438013469233:dw|

  13. anonymous
    • one year ago
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    |dw:1438013934337:dw|

  14. radar
    • one year ago
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    Plugging in the values you will get:|dw:1438014193611:dw|

  15. radar
    • one year ago
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    |dw:1438014360726:dw|

  16. radar
    • one year ago
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    -2.30 =-.07t t = -2.30/-0.07 t=32.9 seconds

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