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A igneous rock contains one half of its original amount of potassium-40 whats the rock closest to?

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0.7 X 10 to the 9th power

1.3 X 10 to the 9th power

2.1 X 10 to the 9th power

2.6 X 10 to the 9th power

Its all in years

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  1. 12,500 million years is closest to 2.6 X 10 to the 9th power, but about 5 times as long.

    K-40 - 1.27E9 years is close to 1.3 X 10 to the 9th power

    The second value agrees with the IAEA value.

    How do you know the rock contains half its original amount of K40?

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