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MMLU-Pro / 9789 / There are N_0 = 10^25 uranium-238 nuclei in a sample. (a) What is the number of…

Problem

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question

There are N_0 = 10^25 uranium-238 nuclei in a sample. (a) What is the number of uranium nuclei remaining in the sample after 10^8 years if the decay rate per nucleus, \lambda, is 5 × 10\Elzbar18sec\Elzbar1? (b) What is the half-life of uranium?

category

physics

options

  1. 8.4 × 10^24, 5.5 × 10^9 years
  2. 8.4 × 10^24, 4.7 × 10^9 years
  3. 5 × 10^24, 7 × 10^9 years
  4. 9.84 × 10^24, 4.5 × 10^9 years
  5. 6.5 × 10^24, 4 × 10^9 years
  6. 9.5 × 10^24, 6.2 × 10^9 years
  7. 7.2 × 10^24, 5 × 10^9 years
  8. 1.2 × 10^24, 3.5 × 10^9 years
  9. 9.84 × 10^24, 6.5 × 10^9 years
  10. 9.2 × 10^24, 3.9 × 10^9 years

src

stemez-Physics

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