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

remain after 20 million years?

User Fknx
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2 Answers

4 votes

Answer: 1/4

Step-by-step explanation:

User Sam Stelfox
by
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2 votes
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
User XstreamINsanity
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