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d2jsp Forums > Diablo II > Archives > Softcore USWest 2009 > Paying 10fg For One Answer
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#1
Dec 29 2009 11:17pm
The radioactive potassium-40 isotope decays to argon-40 with a half-life of 1.2 multiplied by 10^9 yr

A sample of moon rock is found to contain 39% potassium-40 and 61% argon by mass. Calculate the age of the rock.
___years
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#2
Dec 29 2009 11:18pm
3,000,570,010 years
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#3
Dec 29 2009 11:20pm
Quote (brand0123 @ Dec 30 2009 05:18am)
3,000,570,010 years


FOR REALS YO
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#4
Dec 29 2009 11:25pm
1.464 x 10 ^9 years

basically , 1 x full half life ( 1.2 x 10^9 years ) + 22% of a half life ( .264 x 10^9 years )
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#5
Dec 29 2009 11:25pm
Quote (brand0123 @ Dec 30 2009 12:18am)
3,000,570,010 years

122,353,019.5 yrs
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#6
Dec 29 2009 11:27pm
Quote (Agod @ Dec 30 2009 05:25pm)
122,353,019.5 yrs


no
1,464 ,000 , 000 years
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