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Radioactive Decay?

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What is an example of the half-life of an isotope and describe the amount remaining and the time elapsed after five half-periods.

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  1. Carbon-14, half life 5730 years.

    The amount remaining would be 1/ 2^5 = 1/32 of the original amount.

    This would take 5 x 5730 years = 28650 years

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