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Uranium-235, with a Half-Life of 713,000,000 Years, Decays to Lead-207

Question 14

Multiple Choice

Uranium-235, with a half-life of 713,000,000 years, decays to lead-207. If a rock sample is determined to have one-quarter of the uranium-235 content it had when it formed, the age of the rock sample can be estimated to be approximately ________ years old.


A) 178 million
B) 713 million
C) 28.5 billion
D) 1.4 billion

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