How Long Will It Take for a Quarter of the Uranium-238

question 145

Multiple Choice

How long will it take for a quarter of the uranium-238 atoms in a rock to decay to lead-206?

• A) 1.13 billion years
• B) 13.5 billion years
• C) 4.5 billion years
• D) 2.25 billion years
• E) 9 billion years

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