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anonymous
 one year ago
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anonymous
 one year ago
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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Iron59 has a halflife of 45.1 days. How old is an iron nail if the Fe59 content is 25% that of a new sample of iron? Show all calculations leading to a solution.

tkhunny
 one year ago
Best ResponseYou've already chosen the best response.025% is one half and then one half again.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.025=100 e^(.693 t/45.1) Ln(25)=ln(100) .693 t/45.1 ln(25)ln(100)=.693 t/45.1 ln(25/100)=.693t/45.1 t=  45.1/.693 ( ln .25) t=90.2 days?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@ganeshie8 @Compassionate @Nnesha Is this right?

tkhunny
 one year ago
Best ResponseYou've already chosen the best response.0100 ==> 50 in 45.1 days. 50 ==> 25 in 45.1 days.
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