The half-life of $_{92}U^{238}$ is $4.5 \times 10^9$ years. After how many years,the amount of $_{92}U^{238}$ will be reduced to half of its present amount?
- A$9.0 \times 10^9$ years
- B$13.5 \times 10^9$ years
- C$4.5 \times 10^9$ years
- D$4.5 \times 10^{4.5}$ years
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