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We start with 400 atoms of Uranium-238. How many remain after 4.5 billion years?____
After 9 billion years? ____
After 13.5 billion years? ____

Respuesta :

scme1702
The half life of Uranium-238 is about 4.5 billion years.

Amount after:
4.5 billion years = 200 atoms
9 billion years = 100 atoms
13.5 billion years = 50 atoms

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