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Homework Statement
Analysis of potassium and argon atoms in a moon rock sample shows that the ratio of the number of stable Ar-40 atoms to the number of radioactive K-40 atoms is 10.3.
Assume that all the Ar atoms were produces by the decay of K atoms, with a half-life of 1.25x10^ years.
(i)Calculate:
a) the fraction of the original K-40 atoms remaining in the rock
b) the number of half-lives that has elapsed
c) the age of the rock.
(ii) From the answers above, deduce the age of the solar system.
Homework Equations
[tex]N=N_0e^{-\lambda t}[/tex]
The Attempt at a Solution
Can someone guide me on how to start this?
"the number of stable Ar-40 atoms to the number of radioactive K-40 atoms is 10.3."
Now in the formula N=N_0exp(-[itex]\lambda t[/itex]) N is the no. of radioactive atoms at time t, So I am a bit lost.
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