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55. The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration. How long will it take for

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55. The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration. How long will it take for 10% of the U- 238 atoms in a sample of U-238 to decay? If a sample of U238 initially contained 1.51018 atoms when the universe was formed 13.8 billion years ago, how many U-238 atoms does it contain today

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