The half-life of uranium-232 is 70 years.The time for 3/4 of a sample of uranium-232 to decay is
A)35 years.
B)70 years.
C)125 years.
D)140 years.
E)none of the above.

Name: The half-life of uranium-232 is 70 years.The time for 3/4 of a sample of uranium-232 to decay is A)35 years. B)70 years. C)125 years. D)140 years. E)none of the above.
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Question

Quizplus · Accepted Answer

The time for 3/4 of a sample to decay is two half-lives. Since the half-life is 70 years, two half-lives is 140 years.

The Half-Life of Uranium-232 Is 70 Years