• how long will it take for 20% of the u−238 atoms in a sample of u−238 to decay?

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  • The half-life of U-238 is 4.468 billion years, so it will take 4.468 billion years for 50% of the atoms to decay, and 11.21 billion years for 90% of the atoms to decay. 20% of the U-238 atoms would therefore take approximately 2.304 billion years to decay.

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      Asia Gallegos

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