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3. One may assume that when U-238 was formed at the genesis of Earth, an equal amount of 235U was formed. Today the amount of

half life U-235 is 7.04x10^8 years

half life U-238 is 4.468 x10^9 years

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Answer: dass = One) t235 d 238 = enk) t238 Also, N235 = Non è asst N238= No ēdast hence, N238 N235 = Nozzo No:35 +228 t e ē $Using these datas, we get, -dast 138 = + est > 138=et (A235-238) taking en, we get, t as, => t = en (138) (4235-2238) > t = 1

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