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How long will it take for 18 %% of the U−238U−238 atoms in a sample of...

How long will it take for 18 %% of the U−238U−238 atoms in a sample of U−238U−238 to decay?

Express your answer using two significant figures.

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U-238 helf life is 4.468x10 9 years 50% 100 187. 2.303 log Tuod - 2.303 log (100 4.468x109 year oC 34 stret (100-18) 0693 2.3

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