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how old is a mammoth's tusk if there is only 25 percent C-14 remaining in the sample?

a.5700 years
b.11400 years
c.17100 years
d.22800 years

  • science -

    Half disappeared in one half-life.
    Half that remaining disappeared in the next half-life.

  • science -

    ..what does that mean?

  • science -

    Knowing the half-life of C-14 would allow you to take twice the half-life.

    From searching the Internet under "C-14 half life", I found that the half-life of Carbon 14 is 5730 years.

    This should help a little more. Thanks for asking.

  • science -

    b.11400 years

  • Chemistry -

    B. 11400 years

  • science -


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