Uranium-238 (0-23 has a hall-me of 4. and determine that 67% of the original U-238 remains; the other 33% has decayed into lead. How old is the rock? The rock is billion years old. (Round to three decimal places as needed.) w

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Chapter6: Exponential And Logarithmic Functions
Section6.7: Exponential And Logarithmic Models
Problem 15TI: Cesium-137 has a half-life of about 30 years. If we begin with 200 mg of cesium-137, will it take...
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Uranium-238 (U-238) has a half-life of 4.5 billion years. Geologists find a rock containing a mixture of U-238 and lead,
and determine that 67% of the original U-238 remains; the other 33% has decayed into lead. How old is the rock?
The rock is billion years old.
(Round to three decimal places as needed.)
Transcribed Image Text:Uranium-238 (U-238) has a half-life of 4.5 billion years. Geologists find a rock containing a mixture of U-238 and lead, and determine that 67% of the original U-238 remains; the other 33% has decayed into lead. How old is the rock? The rock is billion years old. (Round to three decimal places as needed.)
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