fortforeman5
01.08.2019 •
Mathematics
Suppose you find a rock and measure that 12.5% of the original uranium-235 still remains it, while the other 87.5% has decayed into lead-207. about how old is the rock?
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Ответ:
713x10^6 years x 3 half-lives = 2139x10^6 years= 2.139 billion years.
How old is the rock?
The answer is: 2.139 billion years
Ответ:
The answer to this question is 42