Half life Decay problem
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Half life Decay problem

[From: ] [author: ] [Date: 11-11-14] [Hit: ]
Amount remaining = 100(0.5)^(13.4 billion years / 4.Amount remaining = 12.......
Half life Decay problem?
I'm not sure how to do this problem because it only gives you the half life and the total time of decay...
Uranium-238 decays very slowly, w/ a half-life of 4.47 billion years. What percentage of a sample of uranium -238 would remain after 13.4 billion years?
In detail could you explain this to me??? Thanks

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Amount remaining = Initial Amount(0.5)^(Time passed / time of one half-life)
Amount remaining = 100(0.5)^(13.4 billion years / 4.47 billion years)
Amount remaining = 12.52%
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