Question

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The half-life of uranium-238 is 4.5 × 109 years. The half-life of uranium-234 is 2.5 × 105 years. How many times greater is the half life of uranium-238 than that of uranium 234.
A 2.7 × 1012
B 3.1 × 10-14
C 1.8 × 1014
D 1.8 × 104

Answer 1

Compute the ratio: (4.5 × 10^9) / (2.5 × 10^5) = (4.5/2.5) × 10^(9−5) = 1.8 × 10^4.

Answer: D (1.8 × 10^4).