Question
(co) In a certain rock, the ratio of lead atoms to uranium atoms is $0.300$. Assume that uranium has a half-life of $4.47 \times 10^{9} \mathrm{y}$ and that the rock had no lead atoms when it formed. How old is the rock?
Step 1
The ratio of lead atoms to uranium atoms in the rock is 0.3, and the half-life of uranium is $4.47 \times 10^{9}$ years. We also know that the rock had no lead atoms when it formed. Show more…
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In a certain rock, the ratio of lead atoms to uranium atoms is $0.300 .$ Assume that uranium has a half-life of $4.47 \times 10^{9} \mathrm{y}$ and that the rock had no lead atoms when it formed. How old is the rock?
In a certain rock, the ratio of lead atoms to uranium atoms is 0.300 . Assume that uranium has a half-life of $4.47 \times 10^{9}$ y and that the rock had no lead atoms when it formed. How old is the rock?
A rock contains 91.2% of the amount of uranium-238 that it contained when it was formed. Given that uranium decays with 1st order kinetics and has a half-life of 4.50 billion years, how old is the rock? ( ) 6.49x10^9 yrs ( ) 1.54 x 10^-10 yrs ( ) 4.50x10^9 yrs ( ) 5.98x10^8 yrs
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