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How old is a rock for which you determine that 55 percent of the original uranium-238 remains while the other 45 percent has decayed into lead?
Mkinsie444
3.88 billion years
Wiki User
∙ 6y ago
The rock would be approximately 1.51 billion years old. This estimation is based on the known half-life of uranium-238, which is about 4.5 billion years. By determining that 55 percent of the original uranium-238 remains, you can infer the age of the rock by calculating how many half-lives have passed.
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