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27 December, 01:25

Choose the FALSE statement.

A. All living things contain stable C-12.

B. All living things contain unstable C-14.

C. The half-life of C-14 is about 40,000 years.

D. The lower the C-14 to C-12 ratio is in a remnant of a living thing, the older it is.

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  1. 27 December, 01:52
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    C. The half-life of C-14 is about 40,000 years.

    Explanation:

    The only false statement from the options is that the half-life of C-14 is 40,000yrs.

    The half-life of an isotope is the time it takes for half of a radioactive material to decay to half of its original amount. C-14 has an half-life of 5730yrs. This implies that during every 5730yrs, C-14 will reduce to half of its initial amount.

    All living organisms contain both stable C-12 and the unstable isotope of C-14 The lower the C-14 compared to the C-12 ratio in an organism, the older it is.
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