If a substance has a half-life of 10 million years, what fraction of the atoms remain after 20 million years?

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asked May 19, 2020 184k views

2 Answers

XstreamINsanity · Answer 1 · 2020-05-25T17:40:02+0000

answer is 1/4 of the atoms

at 0 years it would be the full amount (X)

at 10 million years you have half: X/2

at 20 million years you have 1/4 because: (X/2)/2 will equal 1/4

If a substance has a half-life of 10 million years, what fraction of the atoms remain after 20 million years?

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