Today,the Uranium Found on Earth Contains 0

question 12

Multiple Choice

Today,the uranium found on Earth contains 0.720% ²³⁵U (with a half-life of 0.700 billion years) and 99.28% ²³⁸U (with a half-life of 4.50 billion years) .At a time 2.20 billion years ago,what percent of the uranium on Earth was ²³⁸U (assuming that no other uranium isotopes were present) ?

• A) 95.6%
• B) 2.18%
• C) 6.29%
• D) 8.68%
• E) 4.53%

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