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12 July, 11:15

Uranium-238 decays very slowly. its half-life is 4.47 billion years.

What percentage of a sample of Uranium-238 will remain after 13.4 billion years?

i have to test after 3 days!

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  1. 12 July, 13:24
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    13.4 billion years is 3 times of the half-life, 4.47 billion years. So the Uranium-238 will go through three times of half decay. So the remain percentage will be 50%*50%*50%=12.5%.
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