Uranium-235 Has a Half-Life of 7 $\times$ 10⁸ Years $\times$ 10⁵ Yr
B) 1

question 65

Multiple Choice

Uranium-235 has a half-life of 7.04 $\times$ 10⁸ years.How many years will it take for 99.9% of a U-235 sample to decay?

• A) 7.0 \(\times\) 10⁵ yr
• B) 1.0 \(\times\) 10⁶ yr
• C) 4.7 \(\times\) 10⁹ yr
• D) 4.9 \(\times\) 10⁹ yr
• E) 7.0 \(\times\) 10⁹ yr

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