1. Percentage of U₂₃₅ has been artificially increased
  2. Percentage of U has been artificially increased
  3. Percentage of U₂₃₄ has been artificially increased
  4. Extra energy is pumped from outside
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1 Answers

Answer: Option 1

Enriched uranium is a type of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation. Natural uranium is 99.284% 238U isotope, with 235U only constituting about 0.711% of its mass.

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